Boundary Atlas

ZIP code 50450: Lake Mills, IA

ZIP code 50450 is in Lake Mills (76% of residents), in Winnebago County (94%) and Worth County (5.7%), Iowa. 24% of its residents live outside city limits. It is in Iowa's 4th congressional district (94%) and Iowa's 2nd congressional district (5.7%). Its state senate districts are State Senate District 5 (94%) and State Senate District 30 (5.7%); its state house districts are State House District 9 (94%) and State House District 60 (5.7%).

2,827residents (2020 Census)
84.5 sq miland area
1cities and towns
2congressional districts
4voting precincts

See it on the mapAll of Iowa

City and county

City or townShare of ZIP residents
Lake Mills76%

CountyShare of ZIP residents
Winnebago County94%
Worth County5.7%

Town or county subdivisionShare of ZIP residents
Center township85%
Norway township7.1%
Bristol township3.5%
Silver Lake township2.2%
Mount Valley township1.3%
Logan township0.6%

Congressional districts

Congressional districtShare of ZIP residents
Iowa's 4th congressional district (IA-04)94%
Iowa's 2nd congressional district (IA-02)5.7%

This ZIP is split between districts. A mailing address in it could be in either; the map or locate_point gives the district for an exact address.

Elected officials

OfficeMemberContactShare of residents
U.S. Representative (IA-04)Randy Feenstra (R)202-225-442694%
U.S. Representative (IA-02)Ashley Hinson (R)202-225-29115.7%
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 5)Dave Rowley (R)94%
State Senator (State Senate District 30)Doug Campbell (R)5.7%
State Representative (State House District 9)Henry Stone (R)94%
State Representative (State House District 60)Jane Bloomingdale (R)5.7%

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 594%
State Senate District 305.7%

State house districtShare of ZIP residents
State House District 994%
State House District 605.7%

Voting precincts

4 voting precincts overlap ZIP 50450. 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:50450")

ZIP 50450 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.