Boundary Atlas

ZIP code 78747: Austin, TX

ZIP code 78747 is in Austin (81% of residents), in Travis County, Texas. 19% of its residents live outside city limits. It is in Texas's 37th congressional district (67%) and Texas's 27th congressional district (33%). Its state senate district is State Senate District 21; its state house districts are State House District 51 (66%) and State House District 48 (34%).

21,891residents (2020 Census)
22.2 sq miland area
3cities and towns
2congressional districts
8voting precincts

See it on the mapAll of Texas

City and county

City or townShare of ZIP residents
Austin81%
Creedmoor0.4%
Mustang Ridge0.3%

CountyShare of ZIP residents
Travis County100%

Town or county subdivisionShare of ZIP residents
Austin CCD100%

Congressional districts

Congressional districtShare of ZIP residents
Texas's 37th congressional district (TX-37)67%
Texas's 27th congressional district (TX-27)33%

This ZIP is split between districts. A mailing address in it could be in either; the map or locate_point gives the district for an exact address.

State legislative districts

State senate districtShare of ZIP residents
State Senate District 21100%

State house districtShare of ZIP residents
State House District 5166%
State House District 4834%

Voting precincts

8 voting precincts overlap ZIP 78747. 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:78747")

ZIP 78747 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.