ZIP code 63138 is in Spanish Lake (98% of residents), in St. Louis County (100%) and St. Louis city (<0.1%), Missouri. It is in Missouri's 1st congressional district. Its state senate districts are State Senate District 13 (100%) and State Senate District 5 (<0.1%); its state house districts are State House District 66 (82%), State House District 67 (18%) and State House District 76 (<0.1%).
Officials serving now (members of Congress until January 3, 2027). Sources: State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).
12 voting precincts overlap ZIP 63138.
Map them, with each precinct's share of the ZIP's residents.
Get this in your AI agent
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:63138")
ZIP 63138 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.