Boundary Atlas

ZIP code 54858: Milltown, WI

ZIP code 54858 is in Milltown (64% of residents), in Polk County, Wisconsin. 36% of its residents live outside city limits. It is in Wisconsin's 7th congressional district. Its state senate district is State Senate District 25; its state house district is Assembly District 75.

1,493residents (2020 Census)
17.6 sq miland area
1cities and towns
1congressional district
6voting precincts

See it on the mapAll of Wisconsin

City and county

City or townShare of ZIP residents
Milltown64%

CountyShare of ZIP residents
Polk County100%

Town or county subdivisionShare of ZIP residents
Milltown village64%
Milltown town28%
Georgetown town6.8%
Eureka town1.5%

Congressional district

Congressional districtShare of ZIP residents
Wisconsin's 7th congressional district (WI-07)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 25100%

State house districtShare of ZIP residents
Assembly District 75100%

Voting precincts

6 voting precincts overlap ZIP 54858. 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:54858")

ZIP 54858 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.