Boundary Atlas

ZIP code 52073: Jefferson, IA

ZIP code 52073 is in Sherrill (12% of residents) and Balltown (5.0%), in Dubuque County (98%) and Clayton County (2.3%), Iowa. 83% of its residents live outside city limits. It is in Iowa's 2nd congressional district. Its state senate districts are State Senate District 33 (55%), State Senate District 36 (42%) and State Senate District 32 (2.9%); its state house districts are State House District 65 (55%), State House District 72 (42%) and State House District 64 (2.9%).

1,590residents (2020 Census)
48.0 sq miland area
2cities and towns
1congressional district
4voting precincts

See it on the mapAll of Iowa

City and county

City or townShare of ZIP residents
Sherrill12%
Balltown5.0%

CountyShare of ZIP residents
Dubuque County98%
Clayton County2.3%

Town or county subdivisionShare of ZIP residents
Jefferson township55%
Peru township43%
Buena Vista township2.3%
Concord township0.6%

Congressional district

Congressional districtShare of ZIP residents
Iowa's 2nd congressional district (IA-02)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 3355%
State Senate District 3642%
State Senate District 322.9%

State house districtShare of ZIP residents
State House District 6555%
State House District 7242%
State House District 642.9%

Voting precincts

4 voting precincts overlap ZIP 52073. Map them, with each precinct's share of the ZIP's residents.

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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:52073")

ZIP 52073 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.