ZIP code 51340: Fostoria, IA

ZIP code 51340 is in Fostoria, in Clay County, Iowa. 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.

90residents (2020 Census)

0.1 sq miland area

1cities and towns

1congressional district

1voting precincts

See it on the map All of Iowa

City and county

City or town	Share of ZIP residents
Fostoria	100%

County	Share of ZIP residents
Clay County	100%

Town or county subdivision	Share of ZIP residents
Summit township	100%

Congressional district

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

Elected officials

Office	Member	Contact	Share of residents
U.S. Representative (IA-04)	Randy Feenstra (R)	202-225-4426	100%
U.S. Senator	Chuck Grassley (R)	202-224-3744 · contact form	statewide
U.S. Senator	Joni Ernst (R)	202-224-3254 · contact form	statewide
State Senator (State Senate District 5)	Dave Rowley (R)		100%
State Representative (State House District 10)	John Wills (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

Fostoria laws: search for the Fostoria, Iowa code of ordinances
Clay County website: http://www.co.clay.ia.us
Clay County laws: search for the Clay County, Iowa code of ordinances

State legislative districts

State senate district	Share of ZIP residents
State Senate District 5	100%

State house district	Share of ZIP residents
State House District 10	100%

Voting precincts

1 voting precinct overlap ZIP 51340. 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:51340")

ZIP 51340 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.