Boundary Atlas

ZIP code 51401: Carroll, IA

ZIP code 51401 is in Carroll (84% of residents), in Carroll County, Iowa. 16% of its residents live outside city limits. It is in Iowa's 4th congressional district. Its state senate district is State Senate District 6; its state house district is State House District 11.

12,248residents (2020 Census)
168.6 sq miland area
2cities and towns
1congressional district
10voting precincts

See it on the mapAll of Iowa

City and county

City or townShare of ZIP residents
Carroll84%
Willey0.6%

CountyShare of ZIP residents
Carroll County100%

Town or county subdivisionShare of ZIP residents
Carroll city84%
Maple River township3.5%
Grant township3.1%
Pleasant Valley township2.7%
Roselle township2.4%
Kniest township2.1%
Sheridan township1.4%
Arcadia township0.3%
Eden township0.1%
Washington township<0.1%

Congressional district

Congressional districtShare of ZIP residents
Iowa's 4th congressional district (IA-04)100%

Elected officials

OfficeMemberContactShare of residents
U.S. Representative (IA-04)Randy Feenstra (R)202-225-4426100%
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 6)Jason Schultz (R)100%
State Representative (State House District 11)Craig Williams (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 6100%

State house districtShare of ZIP residents
State House District 11100%

Voting precincts

10 voting precincts overlap ZIP 51401. 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:51401")

ZIP 51401 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.