ZIP code 63120 is in St. Louis (87% of residents) and Pine Lawn (13%), in St. Louis city (87%) and St. Louis County (13%), Missouri. It is in Missouri's 1st congressional district. Its state senate districts are State Senate District 5 (87%) and State Senate District 14 (13%); its state house districts are State House District 76 (49%), State House District 84 (38%) and State House District 85 (13%).
Officials serving now (members of Congress until January 3, 2027). Sources: Mayors: Open States (public domain); State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).
9 voting precincts overlap ZIP 63120.
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:63120")
ZIP 63120 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.