Boundary Atlas

ZIP code 57744: Hermosa, SD

ZIP code 57744 is in Hermosa (15% of residents), in Custer County (76%), Pennington County (18%) and Oglala Lakota County (5.9%), South Dakota. 85% of its residents live outside city limits. It is in South Dakota's at-large congressional district. Its state senate districts are State Senate District 30 (94%) and State Senate District 27 (5.9%); its state house districts are State House District 30 (94%) and State House District 27 (5.9%).

2,475residents (2020 Census)
478.6 sq miland area
1cities and towns
1congressional district
6voting precincts

See it on the mapAll of South Dakota

City and county

City or townShare of ZIP residents
Hermosa15%

CountyShare of ZIP residents
Custer County76%
Pennington County18%
Oglala Lakota County5.9%

Town or county subdivisionShare of ZIP residents
East Custer UT61%
Rapid City East UT16%
Hermosa town15%
West Oglala Lakota UT5.9%
Mount Rushmore UT1.5%

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 3094%
State Senate District 275.9%

State house districtShare of ZIP residents
State House District 3094%
State House District 275.9%

Voting precincts

6 voting precincts overlap ZIP 57744. 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:57744")

ZIP 57744 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.