Boundary Atlas

ZIP code 53521: Brooklyn, WI

ZIP code 53521 is in Brooklyn (40% of residents), in Dane County (55%), Green County (38%) and Rock County (7.0%), Wisconsin. 60% of its residents live outside city limits. It is in Wisconsin's 2nd congressional district. Its state senate districts are State Senate District 17 (84%), State Senate District 16 (9.3%) and State Senate District 15 (7.0%); its state house districts are Assembly District 50 (84%), Assembly District 47 (9.3%) and Assembly District 45 (7.0%).

3,857residents (2020 Census)
59.7 sq miland area
1cities and towns
1congressional district
11voting precincts

See it on the mapAll of Wisconsin

City and county

City or townShare of ZIP residents
Brooklyn40%

CountyShare of ZIP residents
Dane County55%
Green County38%
Rock County7.0%

Town or county subdivisionShare of ZIP residents
Brooklyn village27%
Brooklyn town25%
Oregon town19%
Brooklyn village13%
Rutland town9.3%
Union town7.0%

Congressional district

Congressional districtShare of ZIP residents
Wisconsin's 2nd congressional district (WI-02)100%

Elected officials

OfficeMemberContactShare of residents
U.S. Representative (WI-02)Mark Pocan (D)202-225-2906100%
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 17)Howard Marklein (R)84%
State Senator (State Senate District 16)Melissa Ratcliff (Democratic)9.3%
State Senator (State Senate District 15)Mark Spreitzer (Democratic)7.0%
Assembly Member (Assembly District 50)Jenna Jacobson (Democratic)84%
Assembly Member (Assembly District 47)Randy Udell (Democratic)9.3%
Assembly Member (Assembly District 45)Clint Anderson (Democratic)7.0%

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 1784%
State Senate District 169.3%
State Senate District 157.0%

State house districtShare of ZIP residents
Assembly District 5084%
Assembly District 479.3%
Assembly District 457.0%

Voting precincts

11 voting precincts overlap ZIP 53521. 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:53521")

ZIP 53521 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.