Boundary Atlas

ZIP code 78616: Caldwell County, TX

ZIP code 78616 is in Mustang Ridge (3.3% of residents), in Caldwell County (72%), Bastrop County (28%) and Travis County (0.1%), Texas. 97% of its residents live outside city limits. It is in Texas's 27th congressional district. Its state senate districts are State Senate District 21 (72%) and State Senate District 5 (28%); its state house districts are State House District 17 (100%) and State House District 51 (0.1%).

11,605residents (2020 Census)
118.3 sq miland area
1cities and towns
1congressional district
11voting precincts

See it on the mapAll of Texas

City and county

City or townShare of ZIP residents
Mustang Ridge3.3%

CountyShare of ZIP residents
Caldwell County72%
Bastrop County28%
Travis County0.1%

Town or county subdivisionShare of ZIP residents
Lockhart CCD67%
Cedar Creek-Red Rock CCD28%
Luling CCD4.9%
Austin CCD0.1%

Congressional district

Congressional districtShare of ZIP residents
Texas's 27th congressional district (TX-27)100%

Elected officials

OfficeMemberContactShare of residents
U.S. Representative (TX-27)Michael Cloud (R)202-225-7742100%
U.S. SenatorJohn Cornyn (R)202-224-2934 · contact formstatewide
U.S. SenatorTed Cruz (R)202-224-5922 · contact formstatewide
State Senator (State Senate District 21)Judith Zaffirini (Democratic)956-722-229372%
State Senator (State Senate District 5)Charles Schwertner (R)512-863-845628%
State Representative (State House District 17)Stan Gerdes (R)512-321-3720100%
State Representative (State House District 51)Lulu Flores (Democratic)0.1%

Elected in 2024 under TX's previous congressional map; this district's lines changed for the 120th Congress (seated January 3, 2027).

Officials serving now (members of Congress until January 3, 2027). Sources: State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).

Local government

State legislative districts

State senate districtShare of ZIP residents
State Senate District 2172%
State Senate District 528%

State house districtShare of ZIP residents
State House District 17100%
State House District 510.1%

Voting precincts

11 voting precincts overlap ZIP 78616. 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:78616")

ZIP 78616 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.