Boundary Atlas

ZIP code 54423: Polonia, WI

ZIP code 54423 is in Polonia (21% of residents), in Portage County, Wisconsin. 79% of its residents live outside city limits. It is in Wisconsin's 3rd congressional district. Its state senate districts are State Senate District 29 (55%) and State Senate District 24 (45%); its state house districts are Assembly District 87 (55%) and Assembly District 71 (45%).

2,349residents (2020 Census)
48.3 sq miland area
1cities and towns
1congressional district
7voting precincts

See it on the mapAll of Wisconsin

City and county

City or townShare of ZIP residents
Polonia21%

CountyShare of ZIP residents
Portage County100%

Town or county subdivisionShare of ZIP residents
Sharon town55%
Stockton town45%

Congressional district

Congressional districtShare of ZIP residents
Wisconsin's 3rd congressional district (WI-03)100%

Elected officials

OfficeMemberContactShare of residents
U.S. Representative (WI-03)Derrick Van Orden (R)202-225-5506100%
U.S. SenatorRon Johnson (R)202-224-5323 · contact formstatewide
U.S. SenatorTammy Baldwin (D)202-224-5653 · contact formstatewide
State Senator (State Senate District 29)Cory Tomczyk (R)55%
State Senator (State Senate District 24)Patrick Testin (R)45%
Assembly Member (Assembly District 87)Brent Jacobson (R)55%
Assembly Member (Assembly District 71)Vinnie Miresse (Democratic)45%

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

State legislative districts

State senate districtShare of ZIP residents
State Senate District 2955%
State Senate District 2445%

State house districtShare of ZIP residents
Assembly District 8755%
Assembly District 7145%

Voting precincts

7 voting precincts overlap ZIP 54423. 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:54423")

ZIP 54423 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.