Boundary Atlas

ZIP code 20165: Cascades, VA

ZIP code 20165 is in Cascades (36% of residents), Countryside (31%) and Lowes Island (30%), in Loudoun County, Virginia. It is in Virginia's 10th congressional district. Its state senate district is State Senate District 31; its state house districts are House of Delegates District 27 (68%) and House of Delegates District 28 (32%).

33,777residents (2020 Census)
9.8 sq miland area
3cities and towns
1congressional district
10voting precincts

See it on the mapAll of Virginia

City and county

City or townShare of ZIP residents
Cascades36%
Countryside31%
Lowes Island30%

CountyShare of ZIP residents
Loudoun County100%

Town or county subdivisionShare of ZIP residents
Algonkian district94%
Sterling district6.1%

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 31100%

State house districtShare of ZIP residents
House of Delegates District 2768%
House of Delegates District 2832%

Voting precincts

10 voting precincts overlap ZIP 20165. 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:20165")

ZIP 20165 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.