According to the U.S. Census Bureau, the county has a total area of 754 square miles (1,950 km2), of which 748 square miles (1,940 km2) is land and 6.0 square miles (16 km2) (0.8%) is water.[4]
U.S. Decennial Census[5] 1850–2010[6] 2010–2014[7]
2020 census
Karnes County, Texas – Racial and ethnic composition Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos may be of any race.
There were 4,454 households, out of which 34.00% had children under the age of 18 living with them, 53.60% were married couples living together, 13.70% had a female householder with no husband present, and 27.10% were non-families. 24.40% of all households were made up of individuals, and 13.60% had someone living alone who was 65 years of age or older. The average household size was 2.66 and the average family size was 3.15.
In the county, the population was spread out, with 21.80% under the age of 18, 11.50% from 18 to 24, 34.20% from 25 to 44, 18.20% from 45 to 64, and 14.40% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 146.20 males. For every 100 females age 18 and over, there were 162.50 males.
The median income for a household in the county was $26,526, and the median income for a family was $30,565. Males had a median income of $27,260 versus $19,367 for females. The per capita income for the county was $13,603. About 18.50% of families and 21.90% of the population were below the poverty line, including 29.10% of those under age 18 and 20.50% of those age 65 or over.
Economy
This section needs expansion. You can help by adding to it. (March 2013)
Around 2008 ConocoPhillips drilled a well in Karnes County and struck oil, causing an economic boom.[12]
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