Boundary Atlas

ZIP code 53005: Brookfield, WI

ZIP code 53005 is in Brookfield, in Waukesha County, Wisconsin. It is in Wisconsin's 5th congressional district. Its state senate district is State Senate District 5; its state house districts are Assembly District 13 (60%) and Assembly District 15 (40%).

21,433residents (2020 Census)
14.7 sq miland area
1cities and towns
1congressional district
13voting precincts

See it on the mapAll of Wisconsin

City and county

City or townShare of ZIP residents
Brookfield100%

CountyShare of ZIP residents
Waukesha County100%

Town or county subdivisionShare of ZIP residents
Brookfield city100%

Congressional district

Congressional districtShare of ZIP residents
Wisconsin's 5th congressional district (WI-05)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 5100%

State house districtShare of ZIP residents
Assembly District 1360%
Assembly District 1540%

Voting precincts

13 voting precincts overlap ZIP 53005. 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:53005")

ZIP 53005 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.