ZIP code 57775 is in Quinn (27% of residents) and Cottonwood (2.1%), in Pennington County (77%), Haakon County (17%) and Jackson County (6.4%), South Dakota. 71% 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 27 (83%) and State Senate District 24 (17%); its state house districts are State House District 27 (83%) and State House District 24 (17%).
4 voting precincts overlap ZIP 57775.
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:57775")
ZIP 57775 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.