Boundary Atlas

ZIP code 78633: Georgetown, TX

ZIP code 78633 is in Georgetown (65% of residents), in Williamson County, Texas. 35% of its residents live outside city limits. It is in Texas's 31st congressional district. Its state senate district is State Senate District 5; its state house district is State House District 20.

27,736residents (2020 Census)
78.5 sq miland area
1cities and towns
1congressional district
16voting precincts

See it on the mapAll of Texas

City and county

City or townShare of ZIP residents
Georgetown65%

CountyShare of ZIP residents
Williamson County100%

Town or county subdivisionShare of ZIP residents
Round Rock-Georgetown CCD75%
Florence CCD24%
Jarrell CCD1.5%

Congressional district

Congressional districtShare of ZIP residents
Texas's 31st congressional district (TX-31)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 5100%

State house districtShare of ZIP residents
State House District 20100%

Voting precincts

16 voting precincts overlap ZIP 78633. 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:78633")

ZIP 78633 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.