Boundary Atlas

ZIP code 51002: Alta, IA

ZIP code 51002 is in Alta (72% of residents), in Buena Vista County (100%) and Cherokee County (0.2%), Iowa. 28% 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 districts are State House District 5 (96%) and State House District 6 (4.4%).

2,909residents (2020 Census)
109.7 sq miland area
1cities and towns
1congressional district
4voting precincts

See it on the mapAll of Iowa

City and county

City or townShare of ZIP residents
Alta72%

CountyShare of ZIP residents
Buena Vista County100%
Cherokee County0.2%

Town or county subdivisionShare of ZIP residents
Nokomis township82%
Maple Valley township6.0%
Elk township5.0%
Washington township3.4%
Scott township2.5%
Brooke township0.8%
Hayes township0.2%
Diamond township0.1%
Pitcher township0.1%

Congressional district

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

State legislative districts

State senate districtShare of ZIP residents
State Senate District 3100%

State house districtShare of ZIP residents
State House District 596%
State House District 64.4%

Voting precincts

4 voting precincts overlap ZIP 51002. 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:51002")

ZIP 51002 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.