Boundary Atlas

ZIP code 50129: Jefferson, IA

ZIP code 50129 is in Jefferson (83% of residents), in Greene County (100%) and Guthrie County (0.1%), Iowa. 17% of its residents live outside city limits. It is in Iowa's 3rd congressional district. Its state senate district is State Senate District 24; its state house district is State House District 47.

5,040residents (2020 Census)
165.4 sq miland area
1cities and towns
1congressional district
6voting precincts

See it on the mapAll of Iowa

City and county

City or townShare of ZIP residents
Jefferson83%

CountyShare of ZIP residents
Greene County100%
Guthrie County0.1%

Town or county subdivisionShare of ZIP residents
Jefferson city83%
Grant township3.8%
Jackson township3.1%
Bristol township3.1%
Hardin township2.8%
Franklin township2.3%
Greenbrier township1.0%
Dawson township0.3%
Washington township0.3%
Junction township0.1%
Dodge township0.1%
Highland township<0.1%

Congressional district

Congressional districtShare of ZIP residents
Iowa's 3rd congressional district (IA-03)100%

Elected officials

OfficeMemberContactShare of residents
U.S. Representative (IA-03)Zachary Nunn (R)202-225-5476100%
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 24)Jesse Green (R)100%
State Representative (State House District 47)Carter Nordman (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 24100%

State house districtShare of ZIP residents
State House District 47100%

Voting precincts

6 voting precincts overlap ZIP 50129. 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:50129")

ZIP 50129 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.