Boundary Atlas

ZIP code 20155: Gainesville, VA

ZIP code 20155 is in Gainesville (41% of residents) and Linton Hall (21%), in Prince William County, Virginia. 38% of its residents live outside city limits. It is in Virginia's 10th congressional district. Its state senate districts are State Senate District 30 (100%) and State Senate District 29 (0.2%); its state house districts are House of Delegates District 21 (63%) and House of Delegates District 22 (37%).

37,218residents (2020 Census)
25.5 sq miland area
2cities and towns
1congressional district
11voting precincts

See it on the mapAll of Virginia

City and county

City or townShare of ZIP residents
Gainesville41%
Linton Hall21%

CountyShare of ZIP residents
Prince William County100%

Town or county subdivisionShare of ZIP residents
Brentsville district59%
Gainesville district41%

Congressional district

Congressional districtShare of ZIP residents
Virginia's 10th congressional district (VA-10)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 30100%
State Senate District 290.2%

State house districtShare of ZIP residents
House of Delegates District 2163%
House of Delegates District 2237%

Voting precincts

11 voting precincts overlap ZIP 20155. 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:20155")

ZIP 20155 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.