Boundary Atlas

ZIP code 50436: Forest City, IA

ZIP code 50436 is in Forest City (74% of residents), in Winnebago County (84%) and Hancock County (16%), Iowa. 26% of its residents live outside city limits. It is in Iowa's 4th congressional district. Its state senate districts are State Senate District 5 (84%) and State Senate District 28 (16%); its state house districts are State House District 9 (84%) and State House District 56 (16%).

5,816residents (2020 Census)
135.3 sq miland area
1cities and towns
1congressional district
10voting precincts

See it on the mapAll of Iowa

City and county

City or townShare of ZIP residents
Forest City74%

CountyShare of ZIP residents
Winnebago County84%
Hancock County16%

Town or county subdivisionShare of ZIP residents
Forest township74%
Madison township11%
Mount Valley township8.1%
Ellington township4.6%
Linden township1.6%
Crystal township1.3%
Grant township<0.1%

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 584%
State Senate District 2816%

State house districtShare of ZIP residents
State House District 984%
State House District 5616%

Voting precincts

10 voting precincts overlap ZIP 50436. 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:50436")

ZIP 50436 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.