210 Area Code — San Antonio, TX

What is area code 210 and where does it cover?

Area code 210 serves San Antonio and most of Bexar County, with small portions of adjacent counties. It shares the same footprint with overlay 726 (activated 2017). Ten-digit local dialing is required across the 210/726 region.

How did area code 210 evolve over time?

• Nov 1, 1992: 210 created in a split from 512 to serve San Antonio/Hill Country/Rio Grande Valley.

• July 7, 1997: Three-way split created 830 (Hill Country/suburbs) and 956 (Rio Grande Valley), leaving 210 as San Antonio-centric.

• 2017: Overlay 726 approved and activated to relieve projected 2018 exhaustion.

What are the dialing rules and key dates for 210/726?

• Mar 2017: Permissive 7- or 10-digit local dialing began.

• Sep 23, 2017: Mandatory 10-digit dialing started for local calls in San Antonio.

• Oct 2017: 726 entered service; new numbers could be assigned with 726.

Which communities are in 210/726?

The 210/726 overlay covers most of Bexar County (San Antonio and inner suburbs such as Alamo Heights, Converse, Helotes, Kirby, Leon Valley, Live Oak, Schertz, Shavano Park, Universal City, Windcrest), with small portions of Medina, Comal, Guadalupe, Atascosa, and Wilson counties.

Why did Texas add the 726 overlay instead of splitting again?

A modern overlay expands numbering capacity while preserving existing numbers for residents and businesses—avoiding the disruption of forced renumbering that came with the 1997 split. Regulators opted for 726 when 210 approached exhaustion.

What interesting facts are tied to 210?

• Cultural shorthand: “210” is widely used as a local identifier for San Antonio.

• Enclave code: The 210/726 footprint is surrounded by 830, making it an “enclave” area code configuration.

• Keypad trivia: 726 spells “SAN” on a telephone keypad—a tidy nod to San Antonio.