Boundary Atlas

ZIP code 57799: Spearfish, SD

ZIP code 57799 is in Spearfish, in Lawrence County, South Dakota. It is in South Dakota's at-large congressional district. Its state senate district is State Senate District 31; its state house district is State House District 31.

675residents (2020 Census)
0.2 sq miland area
1cities and towns
1congressional district
1voting precincts

See it on the mapAll of South Dakota

City and county

City or townShare of ZIP residents
Spearfish100%

CountyShare of ZIP residents
Lawrence County100%

Town or county subdivisionShare of ZIP residents
Spearfish city100%

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 31100%

State house districtShare of ZIP residents
State House District 31100%

Voting precincts

1 voting precinct overlap ZIP 57799. 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:57799")

ZIP 57799 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.