Blanco County is a county located on the Edwards Plateau in the U.S. state of Texas. As of the 2010 census, the population was 10,497. Its county seat is Johnson City. The county is named for the Blanco River which traverses the county. The State of Texas formed Blanco County in 1858 from portions of Burnet, Comal, Gillespie and Hays counties. The city of Blanco served as the county seat from 1858 to 1890, when it was moved to Johnson City.
According to the U.S. Census Bureau, the county has a total area of 713 square miles (1,850 km), of which 709 square miles (1,840 km) is land and 4.2 square miles (11 km) (0.6%) is water.
Blanco County is located in the Hill Country of central Texas, west of Austin and north of San Antonio. Two significant rivers, the Blanco and the Pedernales, flow through the county.
As of the census of 2000, there were 8,418 people, 3,303 households, and 2,391 families residing in the county. The population density was 12 people per square mile (5/km²). There were 4,031 housing units at an average density of 6 per square mile (2/km²). The racial makeup of the county was 90.97% White, 0.74% Black or African American, 0.59% Native American, 0.19% Asian, 0.01% Pacific Islander, 5.88% from other races, and 1.62% from two or more races. 15.32% of the population were Hispanic or Latino of any race.
There were 3,303 households out of which 30.40% had children under the age of 18 living with them, 61.50% were married couples living together, 7.20% had a female householder with no husband present, and 27.60% were non-families. 24.00% of all households were made up of individuals and 10.80% had someone living alone who was 65 years of age or older. The average household size was 2.50 and the average family size was 2.96.
In the county, the population was spread out with 24.40% under the age of 18, 6.20% from 18 to 24, 25.60% from 25 to 44, 27.10% from 45 to 64, and 16.70% who were 65 years of age or older. The median age was 41 years. For every 100 females, there were 97.70 males. For every 100 females age 18 and over, there were 94.90 males.
The median income for a household in the county was $39,369, and the median income for a family was $45,382. Males had a median income of $31,717 versus $21,879 for females. The per capita income for the county was $19,721. About 8.10% of families and 11.20% of the population were below the poverty line, including 14.20% of those under age 18 and 9.80% of those age 65 or over.