54 topographic sheets and 24 fire insurance atlases across 5 places.
This curated hub for Mercer County, Ohio brings together the page's documented record links, visible map or image evidence where published, and routes to related local records.
Use the page's provenance and linked records to distinguish the source material from the site's navigation and summaries.
Open the original record, preserve its repository and identifier, then use the citation tool for this page as a path back to the source.
Follow the county or state hub for related places and records, then use the guide for a source-aware research sequence.
28 National Register listings · 28 businesses named in the fire insurance atlases from 1890 to 1915 · the 1907 county history tells 0 stories and names 2 people · people the book names include Monterey, St. Joseph And Ferner (Recovery Township, 1907) · St. Henry (Granville Township, 1907) (machine-read).
Sources: the county history on the Internet Archive · the National Register database, National Park Service
Taken for the Office of War Information and the Farm Security Administration, who photographed the country between 1935 and 1944. Works of United States government photographers, with no known restriction on use. Each opens its catalogue record.
Every property in this county listed on the National Register of Historic Places, with the year it was listed and the federal nomination document.
Mercer County holds 0 covered bridges on the National Register, more than any other property type here. Each is a listed structure with a federal nomination on file.
Selected from the Digital Public Library of America's 2 image records catalogued for this county. Every one shown here carries a public-domain status or a licence that permits reuse on a site that carries advertising; non-commercial, share-alike and restricted images are excluded. The selection is spread across the county's towns (at most eight per town), so no single institution's bulk upload crowds out the rest. Each opens the holding library's record, and the complete set at the Digital Public Library of America is one click away.
Flown by the U.S. Geological Survey between 1937 and 1989, the Aerial Photo Single Frames collection is the definitive mid-century view of the land: fields, roads and rivers as the camera saw them. 172 frames touch this county; the selection below spreads across the decades of flights (at most four per year), so one flight cannot crowd out the rest. The full set is free to browse and download at EarthExplorer under the dataset Aerial Photo Single Frames.
The "who lived here, by year" answer: pre-1929 public-domain directory volumes naming the county's people, machine-read and searchable as text.
The thermometers that kept this county's weather, and the gages that watched its rivers, as the federal records hold them. The extremes below are measured values from those records, not estimates.
Who lived here in 1950, one enumeration district at a time, as the Census Bureau described each district. Each row opens its official National Archives result, with Population Schedules and ED Maps available there.
Every Sanborn volume opens with a printed index naming the town's mills, tanneries, hotels and works by proprietor. Those indexes were read off the scanned sheets by machine and then matched to each other, so a business surveyed four times appears here once, with the years it survived. 3 of these 28 were named in more than one atlas. Each carries a crop of the line it was read from: the spelling is the recogniser's and the 1880s lithographer's, and the scan behind it is the proof.
Church
1895 to 1907, named in 2 atlases
Read elsewhere as Oatholie Church & School.
The NOAA Storm Events Database holds 382 reports for this county, causing 3 deaths, 50 injuries and about $47,326,508 in recorded property damage. Each settlement page carries the reports that name it.
| Kind of event | Reports |
|---|---|
| Thunderstorm Wind | 189 |
| Hail | 74 |
| Flood | 60 |
| Tornado | 29 |
| Flash Flood | 27 |
| Heavy Rain | 2 |
| Lightning | 1 |
The most serious of them, by death, then injury, then recorded damage. The accounts are quoted exactly as the forecast office filed them.
| When | Event | Place named | Harm | What the report says |
|---|---|---|---|---|
| April 1965 | Tornado (F4) | not stated | 2 killed, 24 hurt, $2,500,000 | no account filed |
| May 2019 | Tornado (EF3) | Durbin | 1 killed, 8 hurt, $15,000,000 | The tornado appeared to have first touched down west of Celina, near the intersection of Township Line Road and Bunker Hill Road, where about half of a barn's metal roof was removed and strewn in a narrow path to the east-northeast. At least two other barns also lost nearly half of their metal roofing in the vicinity of Bunker Hill Road. Numerous trees in this area, with trunk diameters of 18 to 24 inches, were also snapped and blown down in various directions. This type of damage was consistent with wind speeds of up to 90 mph and associated with an EF1 tornado. ||The next damage occurred to homes and adjacent outbuildings along Mud Pike Road, immediately southeast of the intersection with State Route 118. Two homes retained their main roof structure but many shingles were removed. Two outbuildings and a larger barn were destroyed, likely resulting from EF1 tornado winds of 100 to 110 mph. Additional damage occurred along Hellwarth Road, just south of the intersection with Fairground Road. Several homes and outbuildings were damaged, with the most serious being a home that lost much of its roof and some exterior walls. High-end EF2 tornado winds of 125 to 135 mph likely caused the worst damage at this location. ||The tornado path continued generally along Fairground Road from just east of the intersection with Hellwarth Road to the western corporation limit of the city of Celina. Homes, outbuildings, trees and utility poles were damaged here, and a free-standing cellular communication tower was knocked down. At least two homes suffered partial roof loss and one home lost its entire roof. The cellular tower was a lattice structure at least 300 feet tall and two of the three support attachments at the ground were broken. A 50 to 100 yard swath of trees were snapped and uprooted in a forested area leading up to the western edge of Celina. The damage to the cellular tower and trees was indicative of EF2 tornado wind speeds of 125 to 135 mph. ||More substantial damage was observed just inside the western corporation limit of the city of Celina, along Fairground Road. At least a dozen homes were severely damaged here, with roofs completely uplifted and removed, along with many exterior walls collapsed. One residence was completely lifted from its foundation, with interior walls largely intact, and dropped in an adjoining field approximately 70 yards to the north-northeast. This residence was anchored to a cinder block foundation, with the upper level or two of blocks breaking from the rest under the force of the wind. Significant mud spatter was also observed on what remained of these homes, especially on the north and northeast facing sides, implying a strongly rotating column of air in contact with a nearby muddy field. This type of damage was consistent with wind speeds up to 150 mph and associated with an EF3 tornado. In this area along Fairground Road, a vehicle was thrown into a house, killing a person inside of the house. ||Significant damage continued into a cluster of homes near and northwest of the intersection of Fairground Road and Touvelle Street in Celina. At least two dozen of these homes had partial or complete roof failure and many exterior walls collapsed. Two residences on either side of Jill Avenue were missing large portions of their exterior walls, indicative of winds as high as 140 to 150 mph and associated with an EF3 tornado. Evidence of multiple vortices within the tornado was also evident in the debris pattern here. Several cars were displaced by the wind and uplift in this neighborhood. A thick layer of mud was also spattered on the east and northeast facing sides of these structures, largely opposite the direction of the incoming tornado. ||The degree and extent of damage started to gradually lessen east-northeast from near Touvelle Street to U.S. 127. From there the tornado continued to track farther northeast to near the community of Neptune. An approximately 100 yard swath of trees were snapped and uprooted in a small forested area between U.S. 127 and Celina-Mendon Road, north of Myers Road. A garage roof was displaced off the main structure along Celina-Mendon Road, between State Route 197 and Howick Road, causing exterior walls to also collapse. This damage was likely the result of EF2 tornado winds of 115 to 125 mph. ||A garage was destroyed along State Route 197, just northeast of the intersection with Rice Road. A house farther northeast along Riley Road, just south of the intersection with State Route 197, suffered partial roof removal along with the collapse of a few exterior walls. Based on the damage, wind speeds here were estimated to be at the upper-end of the EF1 range, between 100 and 110 mph. A debris path was evident into the field immediately east-northeast, where the tornado appeared to finally lift. |
| November 2017 | Tornado (EF2) | Celina | 8 hurt, $5,000,000 | Law enforcement initially observed a funnel cloud near the intersection of Main Street and Schunk Road in Celina. Just to the northeast of this report is where it appears the tornado first touched down, where multiple tree limbs were knocked down between Main Street and W Bank Road.||It is believed that the tornado then skirted Grand Lake St. Marys, producing minor tree and structural damage near the corner of Lake Shore Drive and Elmgrove Avenue. The tornado then likely moved back over a small portion of Grand Lake St. Marys before knocking down a fence and a few small trees at the back parking lot of a Wendy's restaurant on E Market Street. A one story home on Vine Street also had shingles removed from about 10 percent of its roof. ||Further east on E Market Street, the tornado intensified as it impacted Lakeshore Auto Sales. This business had its roof completely destroyed. Along Lake Street, several large branches were knocked down on one property, with significant debris splatter on the east-facing side of a home along with some removal of siding.||Further east on E Market Street, another business had a significant portion of its roof removed, and windows at the front of the business were broken. On the 1100 block of E Livingston Street, tree damage was common and several of the homes also exhibited minor roof damage. One of the homes also had one large hardwood tree knocked down onto its second floor, producing significant roof damage. ||To the northeast, an outbuilding associated with a business on Grand Lake Road was completely destroyed. On the other side of Grand Lake Road, significant debris wrapped around a fence on Montgomery Field. Trees were also uprooted on adjacent May Street.||The most significant damage was then observed beginning at Crown Equipment Corporation. A significant portion of the roof was removed, and exterior walls on the southwest side of the building also collapsed. Damage was also noted on the east-facing side of the building. ||Businesses along Havermann Road were also affected, most notably C-Town Wings, where the front windows were blown out, and the Dollar General store which sustained considerable structural damage, including roof collapse and exterior wall failure. Observed damage from the Crown Equipment Corporation to the Dollar General store was consistent with EF2 tornadic winds.||Several businesses within a strip mall along Havermann Road also sustained some damage, particularly a sports store where the front doors were blown in and a portion of the roof collapsed into the store. ||Damage to the northeast of the strip mall became more sparse, however some trees were downed near the intersection of Howick Road and Riley Road. The end of the tornado appears to have occurred near the 8000 block of Riley Road. |
| June 1980 | Tornado (F1) | not stated | 4 hurt, $2,500,000 | no account filed |
| June 2002 | Thunderstorm Wind | Celina | 1 hurt, $50,000 | High winds knocked down over 100 trees in the city, including twenty which were two feet in diameter or larger. There were several reports of trees falling on cars and homes producing minor damage. A woman sustained fractured ribs when a large branch struck her car during the storm. The storm also produced dime sized hail throughout town. |
| June 2012 | Thunderstorm Wind | Celina | 1 hurt, $30,000 | Several large limbs and power poles were down within the city due to thunderstorm winds. Roof of one structure was damaged. One tree fell on a camper at the fairgrounds, injuring one person. |
| November 1965 | Tornado (F1) | not stated | 1 hurt, $25,000 | no account filed |
| June 2012 | Thunderstorm Wind | Celina | 1 hurt, $10,000 | Damage occurred to a stage due to thunderstorm winds at a festival in downtown Celina. One stage crew member was injured. |
| July 1994 | Thunderstorm Wind | Celina | 1 hurt, $5,000 | Trees and limbs were downed, some on power lines. A police officer responding to a call to check on downed power lines had to be treated after stepping out of the car into some standing water which had been electrified by the downed line. |
| June 2000 | Lightning | Celina | 1 hurt | A girl was struck by lightning on a golf course and was hospitalized in critical condition. Time is estimated. |
| November 2017 | Tornado (EF2) | Padua | $11,000,000 | This tornado developed in Delaware County, Indiana, near the town of Eaton and then moved across Blackford and Jay Counties in Indiana before crossing into Mercer County, Ohio at 1418EST near the intersection of St. Anthony Road and County Road 235 (see Storm data for Indiana, Central and Northeast, for more information on the beginning portion of this tornado in Indiana). The tornado traveled northeast in Mercer County for just more than 8 miles before terminating in a wooded area north of Carmel Church Road and west of Now Road. A few pieces of light debris were carried slightly further to the northeast, but the tornado is not believed to have been on the ground east of Now Road.||The vast majority of the surveyed path in Mercer County contained damage consistent with winds of 60 to 100 MPH, including scattered tree damage, significant damage or destruction of outbuildings, and minor damage to well-built homes. In all, 20 to 25 different properties were affected by this tornado in Mercer County.||Damage was determined to be most significant at two different locations along the track, with wind speeds estimated at 120 MPH, or EF2 on the Enhanced Fujita Scale. The first of these locations was a dairy farm on State Route 49 north of St. Anthony Road. At this location, a small home had its roof completely removed, with the removal and collapse of some exterior walls. It was noted that while some walls were collapsed, toe nailing was the primary anchoring mechanism for the roof and walls on this home. Barns and outbuildings on the property were significantly damaged or destroyed and debris from this location was deposited up to a mile downstream.||The second location exhibiting EF2-rated damage was at a property on Mud Pike Road just east of Township Line Road. Here, a well-built residence had the majority of its roof removed, including the entirety of the garage roof. Sections of brick facade were removed from the exterior walls of the home, with significant mud splatter on the east-facing exterior wall. A large well-constructed barn adjacent to this home was completely demolished, with debris thrown about a mile downstream of its source location.||Throughout its track across Mercer County, this tornado exhibited a large and relatively uniform width, with damage observed that indicated a width of near or slightly greater than three tenths of a mile. Some minor damage was even observed outside of this estimated width. Downstream of some of the affected properties, debris fields were observed to be long, wide, and relatively uniform. |
| July 2003 | Flash Flood | Rockford | $2,000,000 | Major flooding continued across the northern part of the county, with more snadbaggin in Rockford. Forty additional homes were evacuated in and around Rockford. Numerous roads remained flooded and closed. |
| June 2021 | Tornado (EF2) | Ft Recovery | $1,000,000 | The first sign of tornadic damage was observed just east of the Indiana/Ohio state line. Trees were snapped along Park Road, indicative of EF0 tornado damage. The tornado then moved southeast and may have briefly lifted, before touching back down and leaving a noticeable swirl in a wheat field between St Joe Road and Wabash Road. The tornado intensified as it moved across Wabash Road, impacting the Fort Recovery Lumber Yard. Multiple roofs were completely lifted off several outbuildings. Additionally, a collapsed cinder block wall was observed at the Fort Recovery Lumber Yard. This was consistent with EF1 damage.||The tornado then continued moving southeast through wooded areas between Wabash Road and Fort Recovery-Minster Road. Hardwood tree damage was noted in the wooded areas. After crossing Fort Recovery-Minster Road, partial removal of an outbuilding roof was noted along with tree damage. More significant damage then became apparent as the tornado continued southeast impacting the Burrville Road/Hart Road area. Multiple homes along Burrville Road sustained substantial roof damage, including total removal of over half the roof of a single family home. The survey team also noted completely destroyed outbuildings, the removal of attached garages, substantial tree damage, and projectiles embedded within an exterior wall.||Several wood power poles along Burrville Road were also completely broken. Debris from Burrville Road was thrown approximately a half mile toward Wourms Road. In addition, the tornado produced damage along Wourms Road, which included more broken wood power poles. The wooded area along Wourms Road also exhibited the most significant tree damage, where numerous hardwood trees were snapped or knocked over. Damage along Burrville Road and Wourms Road was consistent with low end EF2 damage, with maximum winds of around 115 mph.||The tornado seemed to rapidly weaken as it moved southeast to Fox Road and Meiring Road. The only damage seen was minor damage to an outbuilding and partial removal of the top of a silo. No additional damage was observed to the southeast of this area. |
| July 2003 | Flash Flood | Countywide | $1,000,000 | Major flooding continued in Rockford, with total evacuations of around 300 homes. Numerous roads across the northern part of the county were flooded and closed. Several bridges were washed out. Flooding continued south of Celina where Beaver Creek remained out of its banks. |
| July 2003 | Flash Flood | Countywide | $1,000,000 | Major flooding continued. From July 4 through July 8, close to 400 homes sustained some damage from the flooding. Most of the flood damage occurred from Rockford and Mendon south to Celina. Numerous roads and bridges were washed out across the county. |
| March 2024 | Tornado (EF1) | Celina | $500,000 | The tornado initially began in the city of Celina, a couple of blocks east of North Main Street, along East Anthony Street. A few houses received light damage to roofs and a few trees were knocked down. Additional light tree debris was noted along East Anthony Street toward College Avenue. The tornado continued eastward, causing tree and minor roofing damage to houses on Devonshire and Cumberland Drive. One house on Devonshire Drive had more significant roof damage. The tornado moved east from there, causing damage to the Menards store and Eastview Park, before crossing State Route 29. Sporadic tree damage was found between State Route 703 and State Route 29 as the tornado continued east. A few homes on Long Pine Drive and surrounding courts were damaged.||As the tornado neared Riley Road, it took on a more northeast motion, damaging several buildings south of State Route 29 before crossing from south to north. Damaged outbuildings, homes, and snapped/uprooted trees were then observed along Four Turkey Road north of State Route 29. After the tornado crossed State Route 29, the width of observed damage grew quite significantly, suggesting the circulation of the tornado grew. The observed damage, mostly consisting of damaged out-buildings, a few houses, and numerous trees, indicated an intensification of the tornado as well, with a swath of EF-1 damage stretching from Four Turkey Road to the Mercer/Auglaize County line. The tornado entered Auglaize County at 1808EST and continued east across the western part of the county before ending between Bay Road and Kettlersville Road at 1824EST. |
| July 2003 | Flash Flood | Celina | $500,000 | Major flooding continued across the county, with travel virtually at a standstill as many of the county roads were underwater. The worst flooding continued from Celina where Grand Lake Saint Marys was out of its banks, north to Rockford and Mendon with the Saint Marys River in record flood. Homes and businesses were flooded in Rockford, Celina, Mendon, and Montezuma. |
| July 2003 | Flash Flood | Celina | $500,000 | The spillway to Grand Lake Saint Marys overflowed onto US Route 127 and surrounding homes and businesses. An athletic club and medical office were under several feet of water. Beaver Creek remained well out of its banks, causing additional flooding of homes further downstream. |
| May 2019 | Flash Flood | Grand Lake | $350,000 | Up to four inches of rain caused flash flooding in the Montzuma area. State Route 127 was closed due to high water. Numerous houses and trailers in the area of Karafit Road were completely flooded and many roads were impassable. Several vehicles were stranded in high water, leading to a few water rescues. |
| April 2011 | Tornado (EF2) | Celina | $340,000 | At the beginning of the path near Lake Street in Celina, substantial roof and chimney damage was observed and very large trees were uprooted and snapped. Further to the northeast along Havemann Road, damage occurred to a home improvement warehouse, where as much as twenty percent of the roof structure was uplifted and the HVAC units were moved. In addition, lumber impaled roofing material and damage occurred to indoor inventory. Also at this location, wooden fence walls were down and snapped at the base of their four by four fence posts. Nearby, numerous power poles were snapped and metal light posts were down. On the northwest corner of Havemann and Route 29, a large brick free standing grocery building suffered major damage, including nearly all of the roof being lifted off and one of the brick walls collapsing. Further to the northeast along the path, substantial damage occurred to a home along Staeger Road. The entire attached garage was destroyed with nearly a third of the roofing on the home gone. The siding on the second story of the home had been impaled by a two by four section of lumber. A small sport utility vehicle parked in the rear of the home was toppled and a twenty-five foot mobile home was moved nearly thirty yards. A forty by fifty foot steel framed outbuilding was completely demolished. A pontoon boat which was within this outbuilding was also moved at least fifteen yards. Additional damage further to the northeast in Mercer County occurred along Riley Road between Oldtown and Howick Roads. One wooden and one steel barn were destroyed. An additional steel frame building suffered door damage and damage to part of the roof and a wall. Estimated maximum wind speeds based on damage is 115 miles per hour. |
| July 2003 | Flash Flood | Rockford | $300,000 | Roads across the northern part of the county remained flooded and closed with several bridges washed out. The Saint Marys River flooded into town, forcing sixty evacuations as many homes and businesses were submerged in two to three feet of standing water. Sandbagging took place in an effort to keep more water from entering the town with creeks and streams continuing to rise. |
| March 2024 | Tornado (EF1) | Wabash | $250,000 | The tornado initially began at 1740EST over an open field in Adams County, Indiana, north of the intersection of East County Road 1200 South and South County Road 600 East and moved east toward the Indiana/Ohio State line.||The tornado entered Mercer County, Ohio, at 1745EST, along Skeels Road, where minor damage was observed to a house. The most confident corridor of EF-1 tornado damage, estimated to be around 100 mph, occurred shortly after the tornado developed. Most of the damage was confined to a few properties south of the intersection of Skeels Road and State Route 49. Several outbuildings were completely destroyed and one house received some roof damage. The tornado continued eastward and followed Carmel Church Road, where it caused numerous tree and additional outbuilding damage. ||A more southeast motion of the tornado started at the intersection of Carmel Church Road and Erastus Durbin Road. Additional damage was observed between this location and the intersection of Now and Mud Pike Roads. The final corridor of damage was observed along Mud Pike Road and toward the intersection at State Route 118, where several homes were damaged. The tornado dissipated east of this location. |
| February 2011 | Flash Flood | Celina | $250,000 | Multiple homes were flooded with water coming into the windows. Evacuations were also necessary across the flooded area. |
| July 1992 | Tornado (F2) | not stated | $250,000 | no account filed |
| July 1992 | Tornado (F1) | not stated | $250,000 | no account filed |
| May 1989 | Tornado (F1) | not stated | $250,000 | no account filed |
| March 1986 | Tornado (F1) | not stated | $250,000 | no account filed |
| July 2003 | Flash Flood | Rockford | $200,000 | Serious flooding continued across much of the county. Sandbagging continued in Rockford, with fifty more homes evacuated. Water from Grand lake Saint Marys spilled over US Route 127 south of Celina. US Route 127 and US Route 33 were flooded and closed to the north and west of Rockford. |
| April 2019 | Flood | Montezuma | $100,000 | Houses and trailers in the area of Karafit Road were flooded. Several roads were impassable. |
| April 2019 | Flood | Celina | $100,000 | Ohio Route 127 North was completely shut down due to high water. |
| July 2013 | Thunderstorm Wind | Celina | $100,000 | Multiple trees were downed in the county due to thunderstorm winds. A mini mart suffered a partial building collapse in Celina. A tree was downed on top of a car in Celina. |
| February 2011 | Flood | Philothea | $100,000 | Flooding is a continuation from earlier flash flooding. Several roads were impassible, evacuations occurred in a trailer park, and basements were flooded due to the precipitation. Flooding began around 0645 EST on February 28th and continued until around 0900 EST on March 2nd. Damage estimates during March were around one-hundred thousand dollars. |
| March 2011 | Flood | Philothea | $100,000 | Flooding is a continuation from earlier flash flooding on February 28th. Several roads were impassible, evacuations occurred in a trailer park, and basements were flooded due to the precipitation. Flooding began around 0645 EST on February 28th and continued until around 0900 EST on March 2nd. Damage estimates during February were around one-hundred thousand dollars. |
| June 2003 | Flash Flood | Ft Recovery | $100,000 | Homes were flooded in Fort Recovery. Numerous roads had high water across the northern and western portions of the county. |
| April 2011 | Thunderstorm Wind | Chattanooga | $90,000 | A silo was destroyed and farm equipment was damaged due to damaging thunderstorm winds. In addition, a house had siding and roof damage. Trees were also reported down around the area. A barn was destroyed and a large storage shed was damaged due to the winds. |
| May 2024 | Tornado (EF2) | Ft Recovery | $50,000 | The first known damage from this tornado was found on Siegrist Jutte Road, where a few trees were downed. The most significant damage occurred in two groves of trees south of State Route 219, between Wabash Road and Saint Peter Road. Sections of these trees included greater than 70 percent tree loss, with trunks snapped. A few homes along Saint Peter Road also had a significant amount of roof damage. As the tornado continued to the east, several large outbuildings at farm properties were completely demolished or heavily damaged, while damage to well-built homes was generally limited to minor roof damage. The final known damage from this tornado occurred to some outbuildings along Burkettsville Saint Hen Road, just northwest of Coldwater. |
| May 2024 | Tornado (EF1) | Sebastian | $50,000 | The tornado began in a field east of Harrison Road and south of Guadalupe Road. The tornado moved east-northeast and caused significant damage to trees and outbuildings. The tornado moved into Auglaize County, just south of Guadalupe Road, at 1925EST. The tornado continued to move east across Auglaize County before ending at 1933EST, about 2.8 miles north of New Bremen. |
| June 2013 | Thunderstorm Wind | Mendon | $50,000 | A roof was blow off of a home. A tree was blown onto another roof of the home. A radio antenna was blown down, and a large steel barn collapsed due to thunderstorm winds. |
| June 1998 | Thunderstorm Wind | Coldwater | $50,000 | Winds gusting over 70 mph caused numerous downed trees. Also, roofs were blown off several structures. |
| April 1994 | Thunderstorm Wind | Celina | $50,000 | Barn blown down, trees downed. |
| June 1994 | Tornado (F1) | not stated | $50,000 | A tornado touched down in a field near Celina-Mendon Road and flattened some corn and several trees. The funnel lifted back up but touched down again near state road 197 and caused considerable roof damage to a residence and an outbuilding. The last touchdown was about one and one-half miles farther southeast along Riley Road where some sheet metal was removed from a barn roof. |
| June 2013 | Tornado (EF0) | Rockford | $40,000 | The tornado briefly touched down to the West of River Train Road. Ten percent of a large aluminum barn was removed and had four garage doors blown out. Some of the debris from this building caused collateral impact damage to surrounding structures on both north and south facing aspects. A large dent occurred near the top of the southwest side of a grain silo. Another aluminum building incurred siding damage and a second story window was blown in from the south. This property was surrounded by farmland and no additional damage was noted in the area. Based on the damage surveyed, the maximum wind speed from this tornado was estimated to be 75 miles per hour. |
| August 2012 | Thunderstorm Wind | Chattanooga | $40,000 | Two barns were destroyed due to damaging thunderstorm winds. |
| March 2023 | Tornado (EF0) | Maria Stein | $30,000 | The tornado first touched down near Indian Trail Road and State Route 716. The tornado tracked east-northeast and crossed into Auglaize County near the intersection of State Route 364 and Minster Egypt Pike at 2348EST. The tornado continued northeast into Auglaize County before lifting near Bensman Road at 2353EST. Occasional tree and minor structural damage was noted along its path. |
| June 2019 | Flash Flood | Celina Lakefield Arp | $30,000 | Residents along Coldwater Creek were forced to evacuate in the vicinity of St. Anthony Road. |
| February 2008 | Flood | Rockford | $30,000 | A dozen homes were evacuated with sandbagging occurring on the south side of Celina near Grand Lake St. Marys. Numerous roads were flooded and closed, including several roads along the St. Marys River near Mendon. Many homes sustained basement flooding. |
| August 2014 | Thunderstorm Wind | Celina Lakefield Arp | $25,000 | A large section of the roof was lifted off the hanger at the Lakefield Airport. |
| July 1990 | Tornado (F0) | not stated | $25,000 | no account filed |
| March 1976 | Tornado (F1) | not stated | $25,000 | no account filed |
| June 1973 | Tornado (F0) | not stated | $25,000 | no account filed |
| June 1973 | Tornado (F0) | not stated | $25,000 | no account filed |
| July 2020 | Thunderstorm Wind | Celina Lakefield Arp | $20,000 | A hangar was damaged at Lakefield Airport. |
| June 2006 | Tornado (F0) | Rockford | $20,000 | A small tornado briefly touched down near the intersection of US Route 127 and Shelley Road. A barn was destroyed and a few trees were knocked down. |
| August 2006 | Tornado (F0) | St Henry | $20,000 | A tornado touched down southwest of St. Henry. A house sustained some minor damage to the roof tiles. Tree branches were downed in the area, and a swath of corn and bean crops was knocked down. |
| July 2003 | Flash Flood | North Portion | $20,000 | Numerous roads across the northern half of the county were flooded and closed. Flooding problems in Celina worsened as Beaver Creek remained out of its banks and Grand Lake Saint Marys continued to rise. |
| July 2003 | Flash Flood | Celina | $20,000 | Several roads were submerged in one foot of standing water. Homes on the south side of town sustained major basement flooding as Beaver Creek came out of its banks. |
| June 1995 | Thunderstorm Wind | St. Henry | $20,000 | Trees downed, some on a house. |
| April 2024 | Thunderstorm Wind | St Wendelin | $15,000 | A peaked metal roof was blown off of a hog building. |
| June 2006 | Thunderstorm Wind | Chattanooga | $15,000 | Two machine sheds were heavily damaged, and several barns sustained roof damage. A few large trees were also downed. |
| July 2003 | Thunderstorm Wind | Countywide | $15,000 | Trees were downed, and a few structures sustained minor damage. |
The Survey's mineral resources record lists 4 workings inside this county. 2 still produce and 2 are closed or unrecorded. Each settlement page carries the workings within five miles of it.
| Commodity | Workings |
|---|---|
| Limestone, General | 2 |
| Stone, Crushed/Broken | 2 |
The least common of them first, because a county's hundredth gravel pit says nothing its first ten did not.
| Where | Site | Commodity | Status | Recorded |
|---|---|---|---|---|
| John W. Karch Quarry | Limestone, General | Past Producer | Sedimentary | |
| John W. Karch Quarry | Stone, Crushed/Broken | Producer | ||
| Rockford Stone Quarry | Limestone, General | Past Producer | Sedimentary | |
| Rockford Stone Quarry | Stone, Crushed/Broken | Producer |
Museum specimens collected inside this county and catalogued with a date and a place: 371 of them, by kingdom 339 animalia, 24 fungi, 6 plantae, 1 unrecorded, 1 bacteria. Each is a physical object in a named collection, not a sighting. Held by Ohio State University - Fish Division, Columbus, OH (OSUM), Ohio State University - Bird Division, Columbus, OH (OSUM), USNM, CAS, BPI, MVZ among others, and each settlement page carries the specimens collected near it.
The oldest of them. A specimen proves something was collected on that day; its absence proves nothing.
| Photograph | Year | Species | Kingdom | Where | Collector | Catalogue |
|---|---|---|---|---|---|---|
 | 1840 | Silene virginica L. | Plantae | not stated | J. Wolle, D. Blum | USF 85627 |
 | 1886 | Umbra limi (Kirtland, 1840) | Animalia | Montezuma | Meek and Harris | UMMZ 245848 |
 | 1888 | Ardea alba egretta Gmelin, 1789 | Animalia | Celina | J. R. Slonaker | CAS 24690 |
 | 1888 | Calidris canutus (Linnaeus, 1758) | Animalia | Celina | J. R. Slonaker | CAS 24692 |
 | 1888 | Ceryle alcyon alcyon Cramp & Simmons, 1977-1994 | Animalia | Celina | J. R. Slonaker | CAS 24716 |
 | 1888 | Charadrius vociferus Linnaeus, 1758 | Animalia | Celina | J. R. Slonaker | CAS 24861 |
 | 1888 | Cistothorus palustris dissaeptus Bangs, 1902 | Animalia | Celina | J. R. Slonaker | CAS 24621 |
 | 1888 | Gallinago gallinago delicata (Ord, 1825) | Animalia | Celina | J. R. Slonaker | CAS 24804 |
History of Mercer County, Ohio, and Representative Citizens devotes a chapter to each township: its boundaries and streams, who settled it and when, the mills, the schools and the churches. All 11 are reproduced here in full. Each row shows the township's own shape and where it lies in the county, drawn from the Census Bureau's boundary. Which settlements belong to which township is computed from that same boundary, not taken from the book.
| Shape and position in the county | Township | Settlements in it | Length | Sections |
|---|---|---|---|---|
| Center Township | Neptune | 2,466 words | 2 | |
| Dublin Township | Mercer, Rockford | 5,852 words | 3 | |
| Franklin Township | Bass Landing, Club Island, Coldwater Beach, Doss Landing, Duckfoot Landing, Hechts Landing, Lees Landing, Montezuma, Montezuma Acres, The Maples, Turtle Neck Point | 1,369 words | 1 | |
| Gibson Township | Fort Recovery, Sharpsburg | 8,829 words | 2 | |
| Granville Township | Cranberry Prairie, Saint Henry, Wendelin | 2,021 words | 2 | |
| Hopewell Township | Earley, Shively, Tama | 1,215 words | 0 | |
| Liberty Township | Brehm, Bursville, Chattanooga, Durbin, Hinton, Scudder, Skeels Crossroads, Striptown | 858 words | 2 | |
| Marion Township | Carthagena, Cassella, Chickasaw, Maria Stein, Saint Johns, Saint Rosa, Sebastian, Steinman | 1,639 words | 4 | |
| Recovery Township | Monterey, Saint Joseph, Saint Peter | 838 words | 2 | |
| Union Township | Mendon | 2,768 words | 3 | |
| Washington Township | Erastus, Macedon, Padua, Wabash | 2,346 words | 2 |
Everyone History of Mercer County, Ohio, and Representative Citizens stops to write about, with the section that describes them. Among them are the men who founded the place and governed the Territory. Each name opens the passage itself, in the words of 1907.
Named settlements recorded in the Geographic Names Information System, each with the topographic sheets covering it. Villages, hamlets and abandoned places alike. Each is shown with the watercourse or landform it stands on and the survey quadrangle it falls on. The 5 places that were also surveyed for fire insurance come first, with the number of atlases and photographs held for them.
Jefferson township · 45822 · Celina quadrangle
14 sheets, 1914 to 1986
Fire insurance: 7 atlases
Gibson township · 45846 · On Fort Creek · Fort Recovery quadrangle
14 sheets, 1915 to 1986
Fire insurance: 6 atlases
Union township · 45862 · On Twelvemile Creek · Mendon quadrangle
13 sheets, 1914 to 1986
Fire insurance: 4 atlases
Dublin township · 45882 · Rockford quadrangle
12 sheets, 1914 to 1986
Fire insurance: 5 atlases
Jefferson township · 45822 · On Hardin Creek · Celina quadrangle
14 sheets, 1914 to 1986
Franklin township · 45822 · On Eagle Island (historical) · Celina quadrangle
14 sheets, 1914 to 1986
Marion township · 45822 · On Montezuma Creek · Montezuma quadrangle
13 sheets, 1908 to 1986
Franklin township · 45822 · On Chickasaw Creek · Saint Marys quadrangle
14 sheets, 1911 to 1986
Franklin township · 45822 · On Beaver Creek · Celina quadrangle
14 sheets, 1914 to 1986
Franklin township · 45822 · On Prairie Creek · Saint Marys quadrangle
14 sheets, 1911 to 1986
Franklin township · 45822 · On Chickasaw Creek · Saint Marys quadrangle
14 sheets, 1911 to 1986
Jefferson township · 45822 · On Safety Island · Celina quadrangle
14 sheets, 1914 to 1986
Franklin township · 45822 · On Chickasaw Creek · Saint Marys quadrangle
14 sheets, 1911 to 1986
Jefferson township · 45822 · On Safety Island · Celina quadrangle
14 sheets, 1914 to 1986
Jefferson township · 45822 · On Safety Island · Celina quadrangle
14 sheets, 1914 to 1986
Franklin township · 45822 · On Prairie Creek · Saint Marys quadrangle
14 sheets, 1911 to 1986
Washington township · 45828 · On Toti Creek · Fort Recovery quadrangle
14 sheets, 1915 to 1986
Franklin township · 45866 · On Beaver Creek · Montezuma quadrangle
13 sheets, 1908 to 1986
Franklin township · 45822 · On Beaver Creek · Celina quadrangle
14 sheets, 1914 to 1986
Recovery township · 45846 · On Threemile Creek · Coldwater quadrangle
12 sheets, 1908 to 1986
Liberty township · 45822 · On Hickory Branch · New Corydon quadrangle
13 sheets, 1911 to 1986
Liberty township · 45822 · Erastus quadrangle
13 sheets, 1914 to 1986
No longer a settlement
Franklin township · 45822 · On Beaver Creek · Celina quadrangle
14 sheets, 1914 to 1986
Washington township · 45822 · On Crab Branch · New Corydon quadrangle
13 sheets, 1914 to 1986
14 topographic sheets and 7 fire insurance atlases, 1885 to 1940
14 topographic sheets and 6 fire insurance atlases, 1898 to 1946
12 topographic sheets and 5 fire insurance atlases, 1899 to 1927
13 topographic sheets and 4 fire insurance atlases, 1905 to 1928
0 topographic sheets and 2 fire insurance atlases, 1933 to 1943
The complete index, with nothing left out. Each of these is a separate record with its own page: a federal survey report, or the case file that argued a property on to the National Register. Both are public domain and reproduced word for word.
The vanished settlements of Mercer County, the places these records name that are no longer on the map.
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