Caldwell County is a county located in the U.S. state of Texas. It is part of the Austin-Round Rock metropolitan area. In 2000, the population was 32,194. Its county seat is Lockhart. Caldwell County was named in 1848, after Matthew Caldwell, a ranger captain who fought in the Battle of Plum Creek against the Comanches and later against Santa Anna's armies during the Texas Revolution and a signer of the Texas Declaration of Independence.
There were 10,816 households out of which 37.00% had children under the age of 18 living with them, 56.00% were married couples living together, 13.30% had a female householder with no husband present, and 25.30% were non-families. 21.20% of all households were made up of individuals and 9.40% had someone living alone who was 65 years of age or older. The average household size was 2.82 and the average family size was 3.28.
In the county, the population was spread out with 28.30% under the age of 18, 8.50% from 18 to 24, 29.80% from 25 to 44, 20.80% from 45 to 64, and 12.50% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 97.50 males. For every 100 females age 18 and over, there were 92.70 males.
The median income for a household in the county was $36,573, and the median income for a family was $41,300. Males had a median income of $29,295 versus $21,595 for females. The per capita income for the county was $15,099. About 10.40% of families and 13.10% of the population were below the poverty line, including 15.10% of those under age 18 and 15.40% of those age 65 or over.