Boundary Atlas

ZIP code 57718: Blackhawk, SD

ZIP code 57718 is in Blackhawk (39% of residents), Summerset (30%), Wonderland Homes (9.5%) and Piedmont (1.4%), in Meade County (96%) and Pennington County (4.0%), South Dakota. 19% 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 33 (67%) and State Senate District 29 (33%); its state house districts are State House District 33 (67%) and State House District 29 (33%).

7,536residents (2020 Census)
26.6 sq miland area
4cities and towns
1congressional district
9voting precincts

See it on the mapAll of South Dakota

City and county

City or townShare of ZIP residents
Blackhawk39%
Summerset30%
Wonderland Homes9.5%
Piedmont1.4%

CountyShare of ZIP residents
Meade County96%
Pennington County4.0%

Town or county subdivisionShare of ZIP residents
Southwest Meade UT64%
Summerset city30%
Central Pennington UT4.0%
Piedmont city1.4%

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 3367%
State Senate District 2933%

State house districtShare of ZIP residents
State House District 3367%
State House District 2933%

Voting precincts

9 voting precincts overlap ZIP 57718. 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:57718")

ZIP 57718 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.