Ontario, Iowa

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.

• 1912 USGS Ames quadrangle1:62500, 3 printings
• 1914 USGS Ames quadrangle1:62500, 3 printings
• 1954 USGS Waterloo quadrangle1:250000, 4 printings
• 1955 USGS Waterloo quadrangle1:250000, 2 printings
• 1975 USGS Ames West quadrangle1:24000, 2 printings
• 1985 USGS Ames quadrangle1:100000
• 1993 USGS Ames quadrangle1:100000

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 21 fires within 5 miles of Ontario between 2009 and 2020, burning about 89 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.

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

Settlements close enough to share some of these fires:

• Ames
• Gilbert
• Homestead Colony
• Zenorsville
• Kelley
• Bloomington

Every fire recorded in Story County

Regional context, not property-specific evidence. The federal mineral resources record lists 7 workings within 5 miles of Ontario: 4 producers, 3 past producers. 4 still produce. What was taken out: Sand and Gravel, Construction, Stone, Crushed/Broken, Bituminous, Sulfur-Pyrite. Distance is straight-line from the map coordinates, so a quarry counted here may appear on a neighbouring settlement's page as well.

Every working recorded in Story County

Regional context, not property-specific evidence. The National Weather Service names Ontario in 66 storm reports between 2007 and 2025: 22 hail, 20 heavy rain, 12 thunderstorm wind, 6 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.

Every storm recorded in Story County

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

This settlement is recorded in the Geographic Names Information System as feature 459872. 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.