ZIP code 57442 is in Gettysburg (56% of residents) and Swift Bird (5.9%), in Potter County (90%), Dewey County (10.0%) and Sully County (0.5%), South Dakota. 38% 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 23 (90%), State Senate District 28 (10.0%) and State Senate District 24 (0.5%); its state house districts are State House District 23 (90%), State House District 28A (10.0%) and State House District 24 (0.5%).
7 voting precincts overlap ZIP 57442.
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:57442")
ZIP 57442 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.