ZIP code 20109 is in Sudley (43% of residents), Bull Run (38%), Linton Hall (6.3%) and Innovation (2.1%), in Prince William County, Virginia. 9.9% of its residents live outside city limits. It is in Virginia's 10th congressional district. Its state senate district is State Senate District 30; its state house districts are House of Delegates District 21 (74%), House of Delegates District 20 (17%) and House of Delegates District 22 (9.0%).
14 voting precincts overlap ZIP 20109.
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:20109")
ZIP 20109 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.