From the Texas Secretary of State's office:
A voter who has not been issued a driver’s license or social security number may register to vote, but such voter must submit proof of identification when presenting himself/herself for voting or with his/her mail-in ballots, if voting by mail. These voters’ names are flagged on the official voter registration list with the annotation of “ID.” The “ID” notation instructs the poll worker to request a proper form of identification from these voters when they present themselves for voting, unless they are a voter with a permanent exemption on the voter registration certificate. The voter must present one of the seven (7) acceptable forms of identification:
- Texas driver license issued by the Texas Department of Public Safety (DPS)
- Texas Election Identification Certificate issued by DPS
- Texas personal identification card issued by DPS
- Texas concealed handgun license issued by DPS
- United States military identification card containing the person’s photograph
- United States citizenship certificate containing the person’s photograph
- United States passport
