It is located in Central Texas and its county seat is Johnson City.

As of the census[20] of 2000, there were 8,418 people, 3,303 households, and 2,391 families residing in the county.

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.

[21] 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.