Williamsfield is a village in Knox County, Illinois, home to about 531 people across 1.2 square miles. Its ZIP code is 61489.
Homes sold for a median of $240 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 Williamsfield. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Williamsfield’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Chicago O'Hare International Airport (ORD)132 miles away |
|---|---|
| Closer regional airport | General Wayne A. Downing Peoria International Airport (PIA)25 miles away |
| Nearest city of 250,000+ | Chicago, IL137 miles away |
Straight-line distances from the center of Williamsfield; 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.
Williamsfield had 575 residents in the 2020 census, down 7% since 2000.
It’s the 917th largest of 1,450 towns in Illinois by population.
Knox County grew from 43,612 residents in 1900 to 49,967 in 2020.
Knox 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 40.5 inches of rain and melted snow fall in a typical year, with about 25 inches of snow.
Source: NOAA 1991–2020 climate normals, Knoxville, IL weather station (14 miles away).
14,242 jobs at 968 businesses in Knox 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.
Parks (3 nearby)
Libraries (1 nearby)
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.
Public schools here are run by Williamsfield CUSD 210. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Williamsfield Elem SchoolWilliamsfield | Pre-K–4 | 128 | Public | 0.3 mi |
| Williamsfield Middle SchoolWilliamsfield | 5–8 | 83 | Public | 0.3 mi |
| Williamsfield High SchoolWilliamsfield | 9–12 | 97 | Public | 0.3 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.