ZIP code 52340: Tiffin, IA

ZIP code 52340 is in Tiffin (94% of residents), in Johnson County, Iowa. 6.2% of its residents live outside city limits. It is in Iowa's 1st congressional district. Its state senate district is State Senate District 46; its state house districts are State House District 91 (100%) and State House District 92 (0.3%).

4,810residents (2020 Census)

19.1 sq miland area

1cities and towns

1congressional district

5voting precincts

See it on the map All of Iowa

City and county

City or town	Share of ZIP residents
Tiffin	94%

County	Share of ZIP residents
Johnson County	100%

Town or county subdivision	Share of ZIP residents
Clear Creek township	99%
Madison township	0.9%
Union township	0.3%

Congressional district

Congressional district	Share of ZIP residents
Iowa's 1st congressional district (IA-01)	100%

Elected officials

Office	Member	Contact	Share of residents
U.S. Representative (IA-01)	Mariannette Miller-Meeks (R)	202-225-6576	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 46)	Dawn Driscoll (R)		100%
State Senator (State Senate District 43)	Zach Wahls (Democratic)		<0.1%
State Representative (State House District 91)	Judd Lawler (R)		100%
State Representative (State House District 92)	Heather Hora (R)		0.3%
State Representative (State House District 85)	Amy Nielsen (Democratic)		<0.1%

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

Tiffin website: http://www.tiffin-iowa.org/
Tiffin laws: search for the Tiffin, Iowa code of ordinances
Johnson County website: http://www.johnson-county.com
Johnson County laws: search for the Johnson County, Iowa code of ordinances

State legislative districts

State senate district	Share of ZIP residents
State Senate District 46	100%
State Senate District 43	land only

State house district	Share of ZIP residents
State House District 91	100%
State House District 92	0.3%
State House District 85	land only

Voting precincts

5 voting precincts overlap ZIP 52340. 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:

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ZIP 52340 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.