Boundary Atlas

ZIP code 52237: Hopkinton, IA

ZIP code 52237 is in Hopkinton (39% of residents), in Delaware County (97%), Dubuque County (2.1%) and Jones County (1.3%), Iowa. 61% of its residents live outside city limits. It is in Iowa's 2nd congressional district (99%) and Iowa's 1st congressional district (1.3%). Its state senate districts are State Senate District 34 (99%) and State Senate District 33 (1.3%); its state house districts are State House District 67 (99%) and State House District 66 (1.3%).

1,593residents (2020 Census)
84.1 sq miland area
1cities and towns
2congressional districts
6voting precincts

See it on the mapAll of Iowa

City and county

City or townShare of ZIP residents
Hopkinton39%

CountyShare of ZIP residents
Delaware County97%
Dubuque County2.1%
Jones County1.3%

Town or county subdivisionShare of ZIP residents
South Fork township64%
Union township19%
North Fork township6.9%
Hazel Green township4.2%
Delhi township2.5%
Cascade township2.1%
Castle Grove township1.3%

Congressional districts

Congressional districtShare of ZIP residents
Iowa's 2nd congressional district (IA-02)99%
Iowa's 1st congressional district (IA-01)1.3%

This ZIP is split between districts. A mailing address in it could be in either; the map or locate_point gives the district for an exact address.

State legislative districts

State senate districtShare of ZIP residents
State Senate District 3499%
State Senate District 331.3%

State house districtShare of ZIP residents
State House District 6799%
State House District 661.3%

Voting precincts

6 voting precincts overlap ZIP 52237. 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:52237")

ZIP 52237 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.