ZIP code 57366 is in Parkston (68% of residents) and Old Elm Spring Colony (4.9%), in Hutchinson County (97%) and Douglas County (3.0%), South Dakota. 27% 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 19 (97%) and State Senate District 21 (3.0%); its state house districts are State House District 19 (97%) and State House District 21 (3.0%).
6 voting precincts overlap ZIP 57366.
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:57366")
ZIP 57366 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.