ZIP code 20137 is in New Baltimore (25% of residents), in Fauquier County (80%) and Prince William County (20%), Virginia. 75% of its residents live outside city limits. It is in Virginia's 10th congressional district. Its state senate districts are State Senate District 28 (79%), State Senate District 30 (20%) and State Senate District 31 (1.5%); its state house districts are House of Delegates District 61 (79%), House of Delegates District 21 (20%) and House of Delegates District 30 (1.5%).
5 voting precincts overlap ZIP 20137.
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:20137")
ZIP 20137 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.