Exemptions are based on the county of your property, and apply to Homesteads, homeowners over 65, the disabled, disabled veterans and surviving spouses.
512-834-9317 https://www.traviscad.org/
512-930-3787 http://www.wcad.org/
512-268-2522 http://www.hayscad.com
512-303-1930 http://www.bastropcad.org