Boundary Atlas

ZIP code 57750: Interior, SD

ZIP code 57750 is in Interior (16% of residents), in Jackson County (97%) and Pennington County (3.2%), South Dakota. 84% of its residents live outside city limits. It is in South Dakota's at-large congressional district. Its state senate district is State Senate District 27; its state house district is State House District 27.

405residents (2020 Census)
325.2 sq miland area
1cities and towns
1congressional district
4voting precincts

See it on the mapAll of South Dakota

City and county

City or townShare of ZIP residents
Interior16%

CountyShare of ZIP residents
Jackson County97%
Pennington County3.2%

Town or county subdivisionShare of ZIP residents
Southwest Jackson UT71%
Interior town16%
Interior township10%
Castle Butte township3.2%

Congressional district

Congressional districtShare of ZIP residents
South Dakota's at-large congressional district (SD-AL)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 27100%

State house districtShare of ZIP residents
State House District 27100%

Voting precincts

4 voting precincts overlap ZIP 57750. 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:57750")

ZIP 57750 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.