Area codes 713, 281, 832, 346, and 621

Area code 713 was assigned to the southeastern part, from the Sabine River to the Brazos Valley.

On November 2, 1996, area code 713 was split, with most of Houston's suburbs switching to 281.

This was intended as a long-term solution, but rapid growth in demand for telephone services from the proliferation of pagers and cellphones required additional numbering resources within two years in both numbering plan areas.

On May 9, 2013, the Public Utility Commission of Texas (PUC) announced the addition of yet another code, 346, to the Houston overlay as of July 1, 2014.

[2] 621 was reserved a fourth overlay code; the PUC approved its implementation in 2023 and began on January 23, 2025.

Area code 806 Area code 940 Area codes 682 and 817 Area codes 682 and 817 Area codes 214, 469, 972, and 945 Area codes 214, 469, 945, and 972 Area codes 430 and 903 Area code 575 Area code 915 Area code 432 Area codes 281, 346, 713, and 832 Area codes 281, 713, and 832 Area code 979 Area code 936 Area code 409 Area code 361 Area code 956 Area codes 210 and 726 Area codes 210 and 726 Area code 830 Area code 512 Area code 254 Area code 325 Area code 318 Area code 337 Area code 870 Area code 580
Numbering plan areas and area codes of Texas with numbering plan area 281/346/713/832 highlighted.