Boundary Atlas

ZIP code 53172: South Milwaukee, WI

ZIP code 53172 is in South Milwaukee, in Milwaukee County, Wisconsin. It is in Wisconsin's 1st congressional district. Its state senate district is State Senate District 7; its state house district is Assembly District 20.

20,795residents (2020 Census)
4.8 sq miland area
1cities and towns
1congressional district
16voting precincts

See it on the mapAll of Wisconsin

City and county

City or townShare of ZIP residents
South Milwaukee100%

CountyShare of ZIP residents
Milwaukee County100%

Town or county subdivisionShare of ZIP residents
South Milwaukee city100%

Congressional district

Congressional districtShare of ZIP residents
Wisconsin's 1st congressional district (WI-01)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 7100%

State house districtShare of ZIP residents
Assembly District 20100%

Voting precincts

16 voting precincts overlap ZIP 53172. 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:53172")

ZIP 53172 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.