Boundary Atlas

ZIP code 51557: Mondamin, IA

ZIP code 51557 is in Mondamin (44% of residents), in Harrison County (96%) and Burt County (4.1%), Iowa. 56% of its residents live outside city limits. It is in Iowa's 4th congressional district (96%) and Nebraska's 3rd congressional district (4.1%). Its state senate districts are State Senate District 8 (96%) and State Senate District 16 (4.1%); its state house district is State House District 15.

779residents (2020 Census)
75.3 sq miland area
1cities and towns
2congressional districts
6voting precincts

See it on the mapAll of Iowa

City and county

City or townShare of ZIP residents
Mondamin44%

CountyShare of ZIP residents
Harrison County96%
Burt County4.1%

Town or county subdivisionShare of ZIP residents
Morgan township54%
Raglan township31%
Jackson township8.7%
Arizona township4.1%
Taylor township1.2%
Magnolia township0.9%
Little Sioux township0.5%
Clay townshipland only

Congressional districts

Congressional districtShare of ZIP residents
Iowa's 4th congressional district (IA-04)96%
Nebraska's 3rd congressional district (NE-03)4.1%

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)202-225-442696%
U.S. Representative (NE-03)Adrian Smith (R)202-225-64354.1%
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 8)Mark Costello (R)96%
State Senator (State Senate District 16)Ben Hansen (Nonpartisan)4.1%
State Representative (State House District 15)Matt Windschitl (R)96%

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 896%
State Senate District 164.1%

State house districtShare of ZIP residents
State House District 1596%

Voting precincts

6 voting precincts overlap ZIP 51557. It also crosses into NE. Map them, with each precinct's share of the ZIP's residents.

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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:51557")

ZIP 51557 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.