ZIP code 53045: Brookfield, WI

ZIP code 53045 is in Brookfield (84% of residents), in Waukesha County, Wisconsin. 16% of its residents live outside city limits. It is in Wisconsin's 5th congressional district. Its state senate district is State Senate District 5; its state house districts are Assembly District 15 (72%) and Assembly District 13 (28%).

23,651residents (2020 Census)

14.4 sq miland area

1cities and towns

1congressional district

18voting precincts

See it on the map All of Wisconsin

City and county

City or town	Share of ZIP residents
Brookfield	84%

County	Share of ZIP residents
Waukesha County	100%

Town or county subdivision	Share of ZIP residents
Brookfield city	84%
Brookfield town	16%

Congressional district

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

Elected officials

Office	Member	Contact	Share of residents
U.S. Representative (WI-05)	Scott Fitzgerald (R)	202-225-5101	100%
U.S. Senator	Ron Johnson (R)	202-224-5323 · contact form	statewide
U.S. Senator	Tammy Baldwin (D)	202-224-5653 · contact form	statewide
State Senator (State Senate District 5)	Rob Hutton (R)		100%
Assembly Member (Assembly District 15)	Adam Neylon (R)		72%
Assembly Member (Assembly District 13)	Robyn Vining (Democratic)		28%

Officials serving now (members of Congress until January 3, 2027). Sources: State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).

Local government

Brookfield website: https://www.ci.brookfield.wi.us/
Brookfield laws: search for the Brookfield, Wisconsin code of ordinances
Waukesha County website: http://www.waukeshacounty.gov
Waukesha County laws: search for the Waukesha County, Wisconsin code of ordinances

State legislative districts

State senate district	Share of ZIP residents
State Senate District 5	100%

State house district	Share of ZIP residents
Assembly District 15	72%
Assembly District 13	28%

Voting precincts

18 voting precincts overlap ZIP 53045. 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:

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ZIP 53045 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.