Boundary Atlas

ZIP code 61238: Cambridge, IL

ZIP code 61238 is in Cambridge (69% of residents) and Andover (1.9%), in Henry County, Illinois. 29% of its residents live outside city limits. It is in Illinois's 16th congressional district. Its state senate district is State Senate District 47; its state house district is State House District 93.

3,028residents (2020 Census)
101.3 sq miland area
2cities and towns
1congressional district
9voting precincts

See it on the mapAll of Illinois

City and county

City or townShare of ZIP residents
Cambridge69%
Andover1.9%

CountyShare of ZIP residents
Henry County100%

Town or county subdivisionShare of ZIP residents
Cambridge township78%
Andover township10%
Weller township3.4%
Munson township3.3%
Osco township2.5%
Burns township1.6%
Clover township0.2%
Cornwall township0.2%

Congressional district

Congressional districtShare of ZIP residents
Illinois's 16th congressional district (IL-16)100%

Elected officials

OfficeMemberContactShare of residents
U.S. Representative (IL-16)Darin LaHood (R)202-225-6201100%
U.S. SenatorRichard J. Durbin (D)202-224-2152 · contact formstatewide
U.S. SenatorTammy Duckworth (D)202-224-2854 · contact formstatewide
State Senator (State Senate District 47)Neil Anderson (R)309-230-7584100%
State Representative (State House District 93)Travis Weaver (R)309-204-6514100%

Officials serving now (members of Congress until January 3, 2027). Sources: State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).

Local government

State legislative districts

State senate districtShare of ZIP residents
State Senate District 47100%

State house districtShare of ZIP residents
State House District 93100%

Voting precincts

9 voting precincts overlap ZIP 61238. Map them, with each precinct's share of the ZIP's residents.

Get this in your AI agent

Your agent can get these cities, counties, districts and precincts with their shares, and their GeoJSON boundaries, from Boundary Atlas. Add https://atlas-production-d344.up.railway.app/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:

related_geographies(id="us:zcta:61238")

ZIP 61238 here is the Census Bureau's ZIP Code Tabulation Area, which approximates the USPS ZIP Code; PO-box-only ZIPs have none. Districts are the maps in force for the November 3, 2026 election.