Kleberg County is a county located in the U.S. state of Texas. In 2000, its population was 31,549. The county seat is Kingsville and it is part of the Kingsville Micropolitan Statistical Area. The county is named for Robert J. Kleberg, an early settler. Most of the county's land lies within the famed King Ranch, which also extends into neighboring counties.
There were 10,896 households out of which 34.90% had children under the age of 18 living with them, 52.10% were married couples living together, 13.90% had a female householder with no husband present, and 29.50% were non-families. 22.30% of all households were made up of individuals and 7.60% had someone living alone who was 65 years of age or older. The average household size was 2.78 and the average family size was 3.30.
In the county, the population was spread out with 27.30% under the age of 18, 15.70% from 18 to 24, 27.40% from 25 to 44, 19.00% from 45 to 64, and 10.60% who were 65 years of age or older. The median age was 29 years. For every 100 females there were 101.00 males. For every 100 females age 18 and over, there were 98.50 males.
The median income for a household in the county was $29,313, and the median income for a family was $33,055. Males had a median income of $31,179 versus $19,494 for females. The per capita income for the county was $13,542. About 21.20% of families and 26.70% of the population were below the poverty line, including 35.50% of those under age 18 and 15.60% of those age 65 or over.