Boundary Atlas

ZIP code 51351: Milford, IA

ZIP code 51351 is in Milford (69% of residents), Wahpeton (6.0%), West Okoboji (5.5%) and Arnolds Park (1.1%), in Dickinson County, Iowa. 19% of its residents live outside city limits. It is in Iowa's 4th congressional district. Its state senate district is State Senate District 5; its state house district is State House District 10.

4,844residents (2020 Census)
108.0 sq miland area
4cities and towns
1congressional district
7voting precincts

See it on the mapAll of Iowa

City and county

City or townShare of ZIP residents
Milford69%
Wahpeton6.0%
West Okoboji5.5%
Arnolds Park1.1%

CountyShare of ZIP residents
Dickinson County100%

Town or county subdivisionShare of ZIP residents
Okoboji township47%
Milford township23%
Center Grove township17%
Lakeville township11%
Westport township1.2%
Excelsior township0.3%

Congressional district

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

Elected officials

OfficeMemberContactShare of residents
MayorSteve Anderson69%
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 5)Dave Rowley (R)100%
State Representative (State House District 10)John Wills (R)100%

From Wikidata (community-maintained); confirm on the city's website.

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); Mayors: Wikidata (CC0).

Local government

State legislative districts

State senate districtShare of ZIP residents
State Senate District 5100%

State house districtShare of ZIP residents
State House District 10100%

Voting precincts

7 voting precincts overlap ZIP 51351. 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:51351")

ZIP 51351 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.