Boundary Atlas

ZIP code 50273: Winterset, IA

ZIP code 50273 is in Winterset (62% of residents), in Madison County (100%) and Adair County (<0.1%), Iowa. 38% of its residents live outside city limits. It is in Iowa's 3rd congressional district. Its state senate district is State Senate District 12; its state house district is State House District 23.

8,570residents (2020 Census)
195.2 sq miland area
1cities and towns
1congressional district
10voting precincts

See it on the mapAll of Iowa

City and county

City or townShare of ZIP residents
Winterset62%

CountyShare of ZIP residents
Madison County100%
Adair County<0.1%

Town or county subdivisionShare of ZIP residents
Winterset city62%
Union township9.2%
Lincoln township6.8%
Scott township6.2%
Douglas township5.8%
Webster township2.6%
Crawford township1.6%
Jackson township1.2%
Monroe township1.2%
Jefferson township1.2%
Madison township1.1%
South township0.5%
Grand River township<0.1%
Harrison township<0.1%

Congressional district

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

Elected officials

OfficeMemberContactShare of residents
U.S. Representative (IA-03)Zachary Nunn (R)202-225-5476100%
U.S. SenatorChuck Grassley (R)202-224-3744 · contact formstatewide
U.S. SenatorJoni Ernst (R)202-224-3254 · contact formstatewide
State Senator (State Senate District 12)Amy Sinclair (R)100%
State Representative (State House District 23)Bubba Sorensen (R)100%

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 12100%

State house districtShare of ZIP residents
State House District 23100%

Voting precincts

10 voting precincts overlap ZIP 50273. 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:50273")

ZIP 50273 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.