Atascosa County is located in south-central Texas and is part of the San Antonio-New Braunfels Metropolitan Statistical Area. The county seat is Jourdanton.

Atascosa County is governed by a four-member Commissioners Court, with each member representing one of four precincts. The county judge presides as the administrative head of the court, but does not vote except to break a tie. The county judge is elected county-wide. The other members of the court are elected from their respective precincts.

Atascosa County is represented in the Texas House of Representatives by District 43. The county is represented in the Texas Senate by District 19. At the federal level, the county is part of Texas's 23rd congressional district.

For the most up-to-date and in-depth information, please check the public records links below.