Area codes 210 and 726 - Wikipedia
Area codes 210 and 726 are area codes for telephone numbers in the North American Numbering Plan (NANP) in and near San Antonio, 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 .