Boundary Atlas

ZIP code 51249: Sibley, IA

ZIP code 51249 is in Sibley (80% of residents), in Osceola County, Iowa. 20% of its residents live outside city limits. It is in Iowa's 4th congressional district. Its state senate district is State Senate District 3; its state house district is State House District 5.

3,558residents (2020 Census)
126.6 sq miland area
1cities and towns
1congressional district
5voting precincts

See it on the mapAll of Iowa

City and county

City or townShare of ZIP residents
Sibley80%

CountyShare of ZIP residents
Osceola County100%

Town or county subdivisionShare of ZIP residents
West Holman township58%
East Holman township33%
Wilson township4.1%
Viola township3.4%
Goewey township1.6%
Gilman township0.4%
Ocheyedan township0.2%

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 3)Lynn Evans (R)100%
State Representative (State House District 5)Zach Dieken (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 3100%

State house districtShare of ZIP residents
State House District 5100%

Voting precincts

5 voting precincts overlap ZIP 51249. 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:51249")

ZIP 51249 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.