ZIP code 53121: Elkhorn, WI

ZIP code 53121 is in Elkhorn (53% of residents) and Lauderdale Lakes (6.7%), in Walworth County, Wisconsin. 40% of its residents live outside city limits. It is in Wisconsin's 1st congressional district. Its state senate district is State Senate District 11; its state house districts are Assembly District 31 (97%) and Assembly District 33 (3.3%).

19,222residents (2020 Census)

114.4 sq miland area

2cities and towns

1congressional district

32voting precincts

See it on the map All of Wisconsin

City and county

City or town	Share of ZIP residents
Elkhorn	53%
Lauderdale Lakes	6.7%

County	Share of ZIP residents
Walworth County	100%

Town or county subdivision	Share of ZIP residents
Elkhorn city	53%
Sugar Creek town	20%
Lafayette town	11%
La Grange town	8.6%
Delavan town	2.7%
Geneva town	1.7%
Troy town	1.6%
Spring Prairie town	1.1%
Lyons town	0.2%

Congressional district

Congressional district	Share of ZIP residents
Wisconsin's 1st congressional district (WI-01)	100%

Elected officials

Office	Member	Contact	Share of residents
U.S. Representative (WI-01)	Bryan Steil (R)	202-225-3031	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 11)	Steve Nass (R)		100%
Assembly Member (Assembly District 31)	Tyler August (R)		97%
Assembly Member (Assembly District 33)	Robin Vos (R)		3.3%

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

Elkhorn website: http://www.cityofelkhorn.org
Elkhorn laws: search for the Elkhorn, Wisconsin code of ordinances
Lauderdale Lakes website: https://www.lauderdalelakedistrict.com
Lauderdale Lakes laws: search for the Lauderdale Lakes, Wisconsin code of ordinances
Walworth County website: http://www.co.walworth.wi.us
Walworth County laws: search for the Walworth County, Wisconsin code of ordinances

State legislative districts

State senate district	Share of ZIP residents
State Senate District 11	100%

State house district	Share of ZIP residents
Assembly District 31	97%
Assembly District 33	3.3%

Voting precincts

32 voting precincts overlap ZIP 53121. 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 53121 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.