Boundary Atlas

ZIP code 50258: Union, IA

ZIP code 50258 is in Union (52% of residents), in Hardin County (92%) and Marshall County (7.5%), Iowa. 48% of its residents live outside city limits. It is in Iowa's 2nd congressional district (92%) and Iowa's 4th congressional district (7.5%). Its state senate districts are State Senate District 27 (92%) and State Senate District 26 (7.5%); its state house districts are State House District 54 (92%) and State House District 51 (7.5%).

768residents (2020 Census)
54.0 sq miland area
1cities and towns
2congressional districts
3voting precincts

See it on the mapAll of Iowa

City and county

City or townShare of ZIP residents
Union52%

CountyShare of ZIP residents
Hardin County92%
Marshall County7.5%

Town or county subdivisionShare of ZIP residents
Union township86%
Bangor township7.5%
Providence township6.1%
Liberty townshipland only

Congressional districts

Congressional districtShare of ZIP residents
Iowa's 2nd congressional district (IA-02)92%
Iowa's 4th congressional district (IA-04)7.5%

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-02)Ashley Hinson (R)202-225-291192%
U.S. Representative (IA-04)Randy Feenstra (R)202-225-44267.5%
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 27)Annette Sweeney (R)92%
State Senator (State Senate District 26)Kara Warme (R)7.5%
State Representative (State House District 54)Josh Meggers (R)92%
State Representative (State House District 51)Brett Barker (R)7.5%

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 2792%
State Senate District 267.5%

State house districtShare of ZIP residents
State House District 5492%
State House District 517.5%

Voting precincts

3 voting precincts overlap ZIP 50258. 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:50258")

ZIP 50258 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.