In Texas it doesn't matter whether you live in Dallas, Austin, Houston, San Antonio, or any other city, you are required by Texas Insurance Laws to carry a minimum amount of auto insurance liability coverage. The minimum car insurance requirements in Texas are:
$25,000 for injury/death to one person
$50,000 for injury to more than one person
$25,000 for damage to property
This information can be verified with the Texas Department of Insurance:
Texas Department of Insurance
333 Guadalupe
Austin, TX 78701