Boundary Atlas

ZIP code 62040: Granite City, IL

ZIP code 62040 is in Granite City (67% of residents), Pontoon Beach (14%) and Mitchell (3.0%), in Madison County, Illinois. 15% of its residents live outside city limits. It is in Illinois's 13th congressional district. Its state senate districts are State Senate District 56 (100%) and State Senate District 57 (<0.1%); its state house districts are State House District 111 (75%), State House District 112 (25%) and State House District 113 (<0.1%).

40,872residents (2020 Census)
39.9 sq miland area
4cities and towns
1congressional district
32voting precincts

See it on the mapAll of Illinois

City and county

City or townShare of ZIP residents
Granite City67%
Pontoon Beach14%
Mitchell3.0%
Madison0.2%

CountyShare of ZIP residents
Madison County100%

Town or county subdivisionShare of ZIP residents
Granite City township61%
Nameoki township26%
Chouteau township11%
Venice township1.1%
Collinsville township0.4%

Congressional district

Congressional districtShare of ZIP residents
Illinois's 13th congressional district (IL-13)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 56100%
State Senate District 57<0.1%

State house districtShare of ZIP residents
State House District 11175%
State House District 11225%
State House District 113<0.1%

Voting precincts

32 voting precincts overlap ZIP 62040. Map them, with each precinct's share of the ZIP's residents.

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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:62040")

ZIP 62040 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.