Thomson is a village in Carroll County, Illinois, home to about 1,757 people across 2.2 square miles. Its ZIP code is 61285.
Homes sold for a median of $128 per square foot in the three months ending August 2026, a balanced market.
Each card is that ZIP code’s whole market, including any part outside Thomson. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
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| Nearest major airport | Chicago O'Hare International Airport (ORD)112 miles away |
|---|---|
| Closer regional airport | Dubuque Regional Airport (DBQ)43 miles away |
| Nearest city of 250,000+ | Madison, WI83 miles away |
| Nearest city of 1 million+ | Chicago, IL124 miles away |
Straight-line distances from the center of Thomson; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Thomson had 1,610 residents in the 2020 census, up 188% since 2000.
It’s the 540th largest of 1,450 towns in Illinois by population.
Carroll County grew from 18,963 residents in 1900 to 15,702 in 2020.
Carroll County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 84°F in summer, and winter lows average 14°F. About 34.3 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Fulton L&D #13, IL weather station (7 miles away).
3,011 jobs at 363 businesses in Carroll County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
1 doctors and other health care providers list an office in Thomson.
Nearest hospitals
Providers with an office here
| Mental health providers | 1 |
|---|
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Libraries
Museums
Counts are within about 1 mile of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
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Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.