Caldwell County, Texas

Caldwell County
Location within the U.S. state of Texas
Texas's location within the U.S.
Coordinates: 29°49′57″N 97°37′41″W / 29.832399°N 97.628141°W / 29.832399; -97.628141
Country United States
State Texas
FoundedMarch 6, 1848
Named afterMathew Caldwell
SeatLockhart
Largest citySan Marcos
Government
  County judgeHoppy Haden
Area
  Total
546.452 sq mi (1,415.30 km2)
  Land544.541 sq mi (1,410.35 km2)
  Water1.911 sq mi (4.95 km2)  0.35%
Population
 (2020)
  Total
45,883
  Estimate 
(2024)
52,430
  Density96.296/sq mi (37.180/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Congressional district27th
Websiteco.caldwell.tx.us

Caldwell County is a county located in the U.S. state of Texas. As of the 2020 census, the population was 45,883, and was estimated to be 52,430 in 2024, Its county seat is Lockhart. The county was founded on March 6, 1848 and named after Mathew Caldwell, a ranger captain who fought in the Battle of Plum Creek against the Comanches and against Santa Anna's armies during the Texas Revolution. Caldwell was also a signer of the Texas Declaration of Independence.

Caldwell County is part of the Greater Austin metropolitan area.