Area Code Atlas

NPA 210 split from 512

In 1992, area code 210 was created from a split of 512, taking over the western part of the territory including San Antonio and the Rio Grande Valley. Austin retained 512 to minimize disruption to state government operations.

NPA 210 split from 512

Area code 210 was created on November 1, 1992, as a split from area code 512, covering San Antonio, most of the Hill Country, and the Rio Grande Valley. The split was intended to relieve exchanges in the Austin–San Antonio corridor, with Austin retaining 512 to minimize disruption to state agencies.

Declaration of Jeopardy Situation in NPA 210 (Texas)

NANP-Split of 210 (Texas) Numbering Plan Area (NPA)

NPA 956 split from 210

Area code 956 was created on May 25, 1997, as a geographic split from area code 210. The new code served the Lower and Middle Rio Grande Valley regions of Texas, including Brownsville, McAllen, Laredo, and South Padre Island, while 210 continued to serve the San Antonio area.

Extraordinary NPA-Specific Conservation Procedures for 210 NPA (Texas)

NPA 830 split from 210

Area code 830 was created on July 7, 1997, from a split of area code 210 due to rapid growth and number exhaustion. The new code covered the San Antonio suburbs and the Texas Hill Country, completely surrounding area codes 210 and 726. The split was prompted by rapid population growth and increased demand for telephone numbers in the region.

NPA 830 and 956 splits from 210

On July 7, 1997, two separate splits from area code 210 occurred: NPA 830 was created for the San Antonio suburbs and Texas Hill Country, while NPA 956 was created for the southern Rio Grande Valley. Both splits were driven by rapid growth and increased demand for telephone numbers in their respective regions.

Planning for 726 overlay on 210 begins

Planning for an all-service overlay of area code 210 began in June 2015 in response to projections that 210 would exhaust by mid-2018. The process included regulatory review and public input.

726 overlay for 210 announced

On July 21, 2016, the Public Utility Commission of Texas announced that area code 726 would be added as an overlay to the 210 area code region. The overlay was planned to address the projected exhaustion of available numbers in the 210 area by early 2018.

726 overlay announced for 210

Area code 726 was announced in August 2016 as an all-service overlay for the 210 area, covering San Antonio and most of Bexar County. The overlay was intended to address number exhaustion projected for 2018.

NPA 726 overlay on 210 announced

NPA 726 to Overlay NPA 210 (Texas)

Permissive dialing begins for 210/726 overlay

Permissive dialing of both seven and ten-digit numbers began in March 2017 for the 210/726 overlay complex. This allowed callers to use either dialing method before mandatory ten-digit dialing was enforced.

Mandatory 10-digit dialing for 210/726 overlay

Mandatory 10-digit dialing was implemented in September 2017 for all customers in the 210 and 726 area codes, requiring the area code to be dialed for all local calls. This change was required for the activation of the 726 overlay.

Mandatory ten-digit dialing begins for 210/726 overlay

Mandatory ten-digit dialing began in late September 2017 for the 210/726 overlay complex. This change was required to accommodate the new overlay area code and ensure proper call routing.

NPA 726 overlay activated on 210

Area code 726 was assigned as an overlay to area code 210 and activated in October 2017. This overlay was implemented to alleviate exhaustion concerns projected for mid-2018. Public education began in September 2016, permissive dialing started in March 2017, and mandatory ten-digit dialing began in late September 2017.

726 overlay activated on 210

Area code 726 was activated in October 2017 as an overlay to 210, providing additional numbering resources for San Antonio and most of Bexar County.