Boundary Atlas

ZIP code 62018: Alton, IL

ZIP code 62018 is in Alton (20% of residents), Rosewood Heights (14%), Bethalto (14%) and East Alton (4.8%), in Madison County, Illinois. 47% of its residents live outside city limits. It is in Illinois's 13th congressional district. Its state senate district is State Senate District 56; its state house district is State House District 111.

3,412residents (2020 Census)
3.3 sq miland area
4cities and towns
1congressional district
4voting precincts

See it on the mapAll of Illinois

City and county

City or townShare of ZIP residents
Alton20%
Rosewood Heights14%
Bethalto14%
East Alton4.8%

CountyShare of ZIP residents
Madison County100%

Town or county subdivisionShare of ZIP residents
Wood River township80%
Alton township20%

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 house districtShare of ZIP residents
State House District 111100%

Voting precincts

4 voting precincts overlap ZIP 62018. 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:62018")

ZIP 62018 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.