Illiopolis, Illinois

Illiopolis fell from 891 to 846 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.

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.

• 1954 USGS Niantic quadrangle1:62500, 3 printings
• 1958 USGS Decatur quadrangle1:250000, 3 printings
• 1961 USGS Decatur quadrangle1:250000, 2 printings
• 1982 USGS Niantic quadrangle1:24000
• 1985 USGS Springfield quadrangle1:100000, 2 printings

History of Sangamon County, Illinois; Together with Sketches of Its Cities, Villages and Townships ... Portraits of Prominent Persons, and Biographies of Representative Citizens. History of Illinois, published 1881 names this settlement in its chapter on Illiopolis Township. These are the passages that mention it, exactly as the scans read.

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 2 fires within 5 miles of Illiopolis in 2009, burning about 4 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:

• Haynes
• Saunders

Every fire recorded in Sangamon County

Regional context, not property-specific evidence. The National Weather Service names Illiopolis in 7 storm reports between 1996 and 2013: 3 thunderstorm wind, 2 hail, 2 tornado. 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 Sangamon County

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

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.

This settlement is recorded in the Geographic Names Information System as feature 410774. 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.

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.