Andover is a village in Henry County, Illinois, home to about 434 people across 1.0 square miles. Its ZIP code is 61233, and parts of 61238 and 61262 are in Andover too.
Homes sold for a median of $91 per square foot in the three months ending August 2026, a seller’s market.
All in Andover
Mostly Cambridge; part is in Andover
Part is in Andover, part in Swedona and Ophiem
Each card is that ZIP code’s whole market, including any part outside Andover. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Andover’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)131 miles away |
|---|---|
| Closer regional airport | Quad City International Airport (MLI)16 miles away |
| Nearest city of 250,000+ | Madison, WI131 miles away |
| Nearest city of 1 million+ | Chicago, IL139 miles away |
Straight-line distances from the center of Andover; 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.
Andover had 555 residents in the 2020 census, down 7% since 2000.
It’s the 982nd largest of 1,450 towns in Illinois by population.
Henry County grew from 40,049 residents in 1900 to 49,284 in 2020.
Henry County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 86°F in summer, and winter lows average 15°F. About 39.1 inches of rain and melted snow fall in a typical year, with about 28 inches of snow.
Source: NOAA 1991–2020 climate normals, Geneseo, IL weather station (13 miles away).
13,162 jobs at 1,037 businesses in Henry 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 (1 nearby)
Libraries
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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Shares ZIP codes with Cambridge, Swedona, Ophiem and Lynn Center.
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.