Area code 210

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Area code 806 Area code 940 Area codes 682 & 817 Area codes 682 & 817 Area codes 214, 469 & 972 Area codes 214, 469 & 972 Area codes 430 & 903 Area code 505 Area code 915 Area code 432 Area codes 281, 713 & 832 Area codes 281, 713 & 832 Area code 979 Area code 936 Area code 409 Area code 361 Area code 956 Area code 830 Area code 512 Area code 254 Area code 325 Area code 318 Area code 337 Area code 870 Area code 580Map of Texas in blue (with border codes) and area code 210 in red
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Area code 210 is a North American telephone area code for numbers in and near San Antonio, Texas. It is an enclave area code, similar to area code 312 in Chicago and area code 213 in Los Angeles, in that it is completely surrounded by area code 830.

It was created November 1, 1992, in a split from area code 512. Before that date, 512 had served the entire south-central portion of Texas since the area code system was instituted in 1947; 512 was the last of Texas' original four area codes to be split.

The formation of 210 was intended to be a long-term solution in order to relieve exchanges in the Austin–San Antonio corridor. However, within four years 210 was already close to exhaustion because of San Antonio's rapid growth and the popularity of cellular telephones and pagers. This forced a three-way split, which took place on July 7, 1997. Most of Bexar County stayed in 210, while the San Antonio suburbs and the Texas Hill Country were split off as area code 830. The southern portion became area code 956. The 1997 split made San Antonio one of the few cities that are split between two area codes. The portions of San Antonio located in Medina and Comal counties, as well as a few portions of Bexar County, are now in 830.

As of 2014, 210 has an exhaust date within 4 years (i.e. by the end of 2018) but currently does not have an approved relief plan and relief area code at this time.

Counties served by this area code:

Bexar—though the map shows an area larger than Bexar County alone.

Towns and cities served by this area code:

Adkins, Alamo Heights, Artesia Wells, Atascosa, Castle Hills, Cibolo, Converse, Ecleto, Elmendorf, Helotes, Kirby, Leon Springs, Macdona, Olmos Park, Saint Hedwig, San Antonio, Shavano Park, Schertz, Universal City, Von Ormy, Wetmore, Windcrest

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Texas area codes: 210, 214, 254, 281, 325, 346, 361, 409, 430, 432, 469, 512, 682, 713, 737, 806, 817, 830, 832, 903, 915, 936, 940, 956, 972, 979
North: 830
West: 830 area code 210 East: 830
South: 830