Illinois City is a community in Rock Island County, Illinois, home to about 73 people across 0.5 square miles. It has no ZIP code of its own: it’s part of 61259.
Homes sold for a median of $232 per square foot in the three months ending August 2026, a seller’s market.
Each card is that ZIP code’s whole market, including any part outside Illinois City. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Illinois City’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Des Moines International Airport (DSM)143 miles away |
|---|---|
| Closer regional airport | Quad City International Airport (MLI)20 miles away |
| Nearest city of 250,000+ | Madison, WI139 miles away |
| Nearest city of 1 million+ | Chicago, IL168 miles away |
Straight-line distances from the center of Illinois City; 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.
It’s the 1370th largest of 1,450 towns in Illinois by population.
Rock Island County grew from 55,249 residents in 1900 to 144,672 in 2020.
Rock Island County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 85°F in summer, and winter lows average 13°F. About 36.5 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Illinois City Dam 16, IL weather station (7 miles away).
64,307 jobs at 2,992 businesses in Rock Island County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
Nearest hospitals
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances.
Public schools here are run by Rockridge CUSD 300. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Illinois City Elem SchoolIllinois City | K–2 | 108 | Public | 0.8 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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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.