Area codes 210 and 726
Area codes 210 and 726 are telephone area codes in the North American Numbering Plan (NANP) for the San Antonio area in the U.S. state of Texas. Area code 210 was created in an area code split from number plan area 512 in 1992. After only a few years, the threat of number exhaustion forced a reduction of the size of the numbering plan area to the center of the San Antonio metropolitan area in 1997. Area code 726 was assigned to the same numbering plan area in an overlay complex activated in 2017 to alleviate the threat of exhaustion of central office codes that was expected by 2018. Area codes 210 and 726 are enclave codes for an area completely surrounded by numbering plan area 830.
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