Boundary Atlas

ZIP code 78645: Lago Vista, TX

ZIP code 78645 is in Lago Vista (63% of residents), Jonestown (16%) and Point Venture (9.0%), in Travis County, Texas. 12% of its residents live outside city limits. It is in Texas's 10th congressional district. Its state senate district is State Senate District 25; its state house district is State House District 19.

14,051residents (2020 Census)
32.5 sq miland area
3cities and towns
1congressional district
4voting precincts

See it on the mapAll of Texas

City and county

City or townShare of ZIP residents
Lago Vista63%
Jonestown16%
Point Venture9.0%

CountyShare of ZIP residents
Travis County100%

Town or county subdivisionShare of ZIP residents
Northwest Travis CCD100%

Congressional district

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

State legislative districts

State senate districtShare of ZIP residents
State Senate District 25100%

State house districtShare of ZIP residents
State House District 19100%

Voting precincts

4 voting precincts overlap ZIP 78645. 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:78645")

ZIP 78645 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.