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Monmouth, Illinois

18 topographic sheets cover this place, the earliest surveyed in 1921 and the latest in 1998. It stands in Monmouth Township. It lies in ZIP code area 61462. The Survey maps it on the Monmouth quadrangle. 8,902 people lived here at the 2020 count. It stands 755 feet above sea level.

Research this city

Monmouth within Warren County

On record in Monmouth

Buildings and businesses the archive holds for this place. Each opens its own page, with the source record it came from.

On the National Register 10 records

Population over time

2 figures

Monmouth fell from 9,444 to 8,902 between 2010 and 2020. These are the recorded population figures Wikidata holds for this place, reached through the Geographic Names Information System number this page is keyed on rather than by name, so they belong to this place and not to another of the same name. Most are census counts, but not all are: an early figure may be a founding or settlement estimate, and an estimate published within five years of a census is left out. The change column is computed, and is left blank where more than 20 years separate a figure from the one before it, because a gap that long is not a change between two counts.

YearPeople Change
20109,444
20208,902-542 (-6%)

Topographic sheets covering this place

10 surveys from 18 printed sheets

Matched by testing this settlement's coordinate against the published boundary of every sheet in the United States Geological Survey's historical collection. Each opens the scanned sheet at the Survey.

Fires near this place

5 since 2014

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 5 fires within 5 miles of Monmouth in 2014, burning about 20 acres in total. None started naturally. None was recorded as arson. Distance is straight-line from the map coordinates, so a fire counted here may appear on a neighbouring settlement's page as well.

Reported cause Fires
Debris and open burning4
Smoking1

The most recent of them, most recent first, with the day each was reported and the service that recorded it.

DateCause SizeReported by Name on the report
22 May 2014Debris and open burning3.0 acresIllinois Division of Forestry Resources2014-341
9 April 2014Smoking9.0 acresIllinois Division of Forestry Resources2014-235
9 April 2014Debris and open burning2.0 acresIllinois Division of Forestry Resources2014-239
8 April 2014Debris and open burning1.0 acresIllinois Division of Forestry Resources2014-231
20 April 2014Debris and open burning5.0 acresIllinois Division of Forestry Resources2014-264

Settlements close enough to share some of these fires:

Every fire recorded in Warren County

Mines and quarries near this place

3 within 5 miles

Regional context, not property-specific evidence. The federal mineral resources record lists 3 workings within 5 miles of Monmouth: 2 occurrences, 1 plant. 1 still produces. What was taken out: Stone, Crushed/Broken. Distance is straight-line from the map coordinates, so a quarry counted here may appear on a neighbouring settlement's page as well.

Where SiteCommodity StatusRecorded
Limestone ProspectStone, Crushed/BrokenOccurrence
Limestone ProspectStone, Crushed/BrokenOccurrence
Monmouth Quarry and MillStone, Crushed/BrokenPlant

Every working recorded in Warren County

Storms near this place

60 of 71 shown

Regional context, not property-specific evidence. The National Weather Service names Monmouth in 71 storm reports between 1996 and 2025: 40 thunderstorm wind, 13 hail, 9 tornado, 5 flash flood. No death or injury is recorded in these reports. Each account below is quoted exactly as the forecast office filed it, from the NOAA Storm Events Database, and each date opens the federal record of that event.

WhenEvent Place namedHarm What the report says
May 2003HailMonmouth$2,000,000no account filed
May 2003Flash FloodMonmouth$1,000,0006 inches water covering intersection of US 67 and 210th Ave
April 2010Thunderstorm WindMonmouth$25,000Wind gusts estimated to be 70 mph blew down several power poles and ripped the roof off of a building on the north side of Monmouth, IL at 508 pm April 30.
August 2003LightningMonmouth$25,000Tree struck and fell onto 2 garages
May 2011Thunderstorm WindMonmouth$10,000Wind gusts estimated to be 70 mph snapped a 6 to 7 inch diameter tree off at the base in Monmouth, IL at 533 pm CDT May 25. The tree fell onto a house causing some roof damage.
June 2009Thunderstorm WindMonmouth$10,000Winds estimated to be 60 mph blew some trees down in Monmouth, IL around 604 pm June 1. One tree fell onto a car.
August 2007Thunderstorm WindMonmouth$10,000Winds estimated to be 80 mph blew down several trees and power lines in Monmouth, IL.
June 2005Thunderstorm WindMonmouth$10,000Trees down
April 1998Tornado (F1)Monmouth$8,000no account filed
June 2012Thunderstorm WindMonmouth$5,000Wind gusts estimated to be 75 mph blew down some trees and power lines in Monmouth, IL at 635pm CDT June 16.
July 2009Thunderstorm WindMonmouth$5,000Wind gusts estimated to be 70 mph blew down some power poles in Monmouth, IL around 1056 pm July 24.
July 2004Flash FloodMonmouth$5,000Mainly nuisance flooding occurred due to the heavy rainfall with water only collecting around 5 inches deep on streets. However, in areas of poor drainage, water collected 1 to 2 feet deep on roads causing cars to stall out.
April 2000Thunderstorm WindMonmouth$5,000Thunderstorm winds blew down a chimney at a residence and several trees. The roof of a machine shed, grain bins, and a barn were also damaged.
April 1998Tornado (F1)Monmouth$3,000no account filed
July 2009Thunderstorm WindMonmouth$2,500Wind gusts estimated to be 70 mph blew down some power lines on the south end of Monmouth, IL around 1058 pm July 24.
March 2006Thunderstorm WindMonmouth$2,000Winds estimated at greater than 50 mph from Lake Warren to Alexis.
August 2003Thunderstorm WindMonmouth$1,500Tree uprooted
July 2004Thunderstorm WindMonmouth$1,0009-10 inch diameter limbs down
April 2000Thunderstorm WindMonmouth$500Thunderstorm winds blew down a large tree, which blocked U.S. Highway 67.
March 1998Thunderstorm WindMonmouth$500Window was blown out at County Jail.
June 2025Tornado (EF1)Monmouth-An EF1 tornado with maximum wind speeds of 100 mph touched down on the south side of Monmouth, and move northeast through town, damaging trees, sheds, and a garage. A roof was torn off a mobile home, and roof damaged on a house. It continued northeast where it tore the roof off a shop building and damaged trees southeast of Gerlaw.
June 2025Thunderstorm WindMonmouth-Estimated 50 to 60 mph wind gusts with torrential rain. Relayed from HAM radio.
July 2025Thunderstorm WindMonmouth-A trained spotter reported 1 to 2 inch tree limbs down.
August 2025Funnel CloudMonmouth-Brief funnel cloud with video evidence from social media.
May 2024Thunderstorm WindMonmouth-A few 3 inch diameter tree branches down. The time was estimated from radar data.
May 2022HailMonmouth-Dime to quarter size hail and torrential rain in Monmouth.
May 2022Tornado (EFU)Monmouth-A brief landspout tornado was reported by law enforcement. No damage was observed to assign an EF-scale rating.
May 2022Tornado (EFU)Monmouth-A brief landspout tornado was reported by emergency management. No damage was observed to assign an EF-scale rating.
June 2021Thunderstorm WindMonmouth-Two large tree limbs were blown down.
August 2020Thunderstorm WindMonmouth-Several trees and a few power lines were blown down in Monmouth.
August 2019Thunderstorm WindMonmouth-Law enforcement reported both trees and power lines down in Monmouth and just north of the city.
October 2017Thunderstorm WindMonmouth-A National Weather Service storm survey team determined the damage to the large section of the Monmouth Fire Station was caused by straight line thunderstorm winds. The wind caused two garage doors to fail first, which then allowed air to push into the building, lifting a 20 foot wide, 80 foot long section of the roof off the building. Additional shingle damage and minor tree damage in the area indicated straight line winds.
July 2017Thunderstorm WindMonmouth-Local law enforcement reported two trees were down.
June 2016Thunderstorm WindMonmouth-An Illinois DOT station measured a 77 mph gust along and multiple reports of flattened corn were also received from near that area.
June 2016Thunderstorm WindMonmouth-A member of the public reported two locations of trees down, one on homes in Monmouth College, and another on a mobile home in Monmouth. The time of this report has been estimated from radar.
July 2015Flash FloodMonmouth-Numerous photos of water flowing down streets, images were received via social media.
May 2014HailMonmouth-Golf ball sized hail fell in Monmouth, IL at 428 pm CDT May 11.
May 2014HailMonmouth-Quarter sized hail fell in Monmouth, IL at 429 pm CDT May 11.
May 2013Thunderstorm WindMonmouth-A trained spotter measured winds of 62 mph.
May 2013Thunderstorm WindMonmouth-A trained spotter reported several trees down.
September 2011HailMonmouth-Golf ball sized hail fell in Monmouth, IL at 335 pm CDT September 3.
September 2011HailMonmouth-Quarter sized hail fell in Monmouth, IL at 345 pm CDT September 3.
September 2011HailMonmouth-Half dollar sized hail fell in Monmouth, IL at 335 pm CDT September 3.
April 2010Thunderstorm WindMonmouth-Wind gusts estimated to be 65 mph were observed about 1 mile north of Monmouth, IL at 505 pm April 30. Heavy rain and pea sized hail was also noted.
April 2010Thunderstorm WindMonmouth-Wind gusts estimated to be 60 mph were observed about 1 mile north of Monmouth, IL at 502 pm April 30.
November 2010HailMonmouth-A trained spotter meaured hail to penny size near Monmouth.
June 2010Thunderstorm WindMonmouth-Wind gusts estimated to be 60 mph were observed 1 mile west of Monmouth, IL at 534 pm June 23.
June 2010Thunderstorm WindMonmouth-Wind gusts estimated to be 70 mph were observed 1 mile west of Monmouth, IL at 535 pm CDT June 23. Trees were downed in Monmouth.
June 2010Thunderstorm WindMonmouth-Wind gusts measured to be 60 mph were observed 4 miles west southwest of Coldbrook, IL at 547 pm June 23.
June 2010HailMonmouth-Quarter sized hail fell about 2 miles west of Monmouth, IL around 1029 pm June 1.
June 2008HailMonmouth-Quarter-sized hail fell in Monmouth, IL at 1:53 pm June 15.
August 2008Thunderstorm WindMonmouth-Wind gusts estimated to be 60 mph blew down some tree branches in Monmouth, IL at 357 am August 5.
June 2006Thunderstorm WindMonmouth-from co-op observer at the ag station northwest of town; areas of waist high corn blown down around the local area.
July 2004Heavy RainMonmouth-Street flooding
June 2002Flash FloodMonmouth-Highway 164 covered with water 6 to 12 inches deep.
June 2002Flash FloodMonmouth-Highway 67 closed due to high water.
May 2001Thunderstorm WindMonmouth-Law enforcement estimated winds reached 60 mph for nearly 5 minutes.
April 2000HailMonmouth-Penny-sized hail reported by law enforcement official.
October 2000Thunderstorm WindMonmouth-Large tree limbs downed.
October 2000Thunderstorm WindMonmouth-Several trees downed on city streets.

Every storm recorded in Warren County

Nearest settlements

The eight closest, with where each one stands in the county. Distances are straight-line, computed from the Geographic Names Information System coordinates.

Map PlaceDistance Sheets
Ormonde4.3 miles18
Eleanor5.5 miles18
Gerlaw5.7 miles18
Phelps5.8 miles18
Kirkwood6.2 miles18
Larchland6.3 miles18
Spring Grove (historical)6.3 miles11
Denny (historical)6.4 miles18

Elsewhere

Matched on this settlement's Geographic Names Information System number rather than its name, so it cannot be a different place of the same name in another state.

Wikipedia article on MonmouthAn encyclopaedic summary. Its text is share-alike, so it is linked here rather than copied.
Wikidata item Q577638The structured record the population and elevation above come from. Public domain (CC0).

Provenance

This settlement is recorded in the Geographic Names Information System as feature 413727. The sheet list is computed by point-in-boundary test against the United States Geological Survey's historical topographic inventory. Both are works of the United States government and carry no copyright under 17 U.S.C. 105.

Wildfire. Short, Karen C. 2022. Spatial wildfire occurrence data for the United States, 1992-2020 [FPA_FOD_20221014]. 6th Edition. Fort Collins, CO: Forest Service Research Data Archive. https://doi.org/10.2737/RDS-2013-0009.6 Collected with United States Government funding and usable without additional permissions or fees.

Mines and quarries. USGS Mineral Resources Data System (MRDS) https://mrdata.usgs.gov/mrds/ A work of the United States government, no copyright under 17 U.S.C. 105.

Storms. NOAA National Centers for Environmental Information, Storm Events Database https://www.ncei.noaa.gov/stormevents/ A work of the United States government, no copyright under 17 U.S.C. 105. Narratives are quoted verbatim from the National Weather Service report and are not edited or summarised.