From the Texas Secretary of State
You must be a citizen of the United States and at least 17 years and 10 months of age on the date you apply. Read the instructions on the application form in its entirety, fill it out and mail it to the Voter Registrar in your county or drop it by the Voter Registrar’s office.
Need the address?
All voters who register to vote in Texas must provide a Texas driver’s license number or personal identification number issued by the Texas Department of Public Safety. If you don’t have such a number, simply provide the last four digits of your social security number. If you don’t have a social security number, you need to state that fact.
Download a Voter Registration Form Here Fill it out and mail it to your county voter registrar or drop it by their office.
NOTE: To avoid problems with applications for mail-in ballots now and in the future you may want to input both your TDL number and the last four numbers of your SS number.
Local Sources for Voter Registration
Check for Voter Registration Forms at Your Local Library or Post Office