ZIP code 46321 is in Munster, in Lake County, Indiana. It is in Indiana's 1st congressional district. Its state senate district is State Senate District 2; its state house district is State House District 12.
21 voting precincts overlap ZIP 46321.
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:46321")
ZIP 46321 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.