Cities and prefixes for each area code have been provided by the North American Numbering Plan Administration (NANPA), which oversees the area code number assignment system. This information will change as new prefixes are added or returned.

Prefix information will be updated periodically from the NANPA database of Texas prefixes in use in each area code. All prefixes listed on the Texas Area Codes site reflect NANPA numbering data through July, 2002. Because of the way telephone data is assembled, some cities may not be on the list. If any city is not listed or is listed incorrectly, please send the city, prefix, and area code to areacodes@puc.state.tx.us and it will be added. Any questions or comments about the Texas Area Codes section of the PUC site should also be sent to this address.