[3] The county and region was settled primarily by German emigrants in the 1800s.

[4] Austin County is included in the Houston–The Woodlands–Sugar Land Metropolitan Statistical Area.

About 16.13% of the population was Hispanic or Latino of any race, and 26.9% were of German, 8.0% Czech, 6.4% English, and 5.0% Irish ancestry according to Census 2000.

Every Republican presidential candidate since 2000 has carried more than 70% of the county vote.

Areas in Brazos ISD are in Wharton County Junior College District.

[13] The TTC-69 component (recommended preferred) of the once-planned Trans-Texas Corridor went through Austin County.