Map of California area codes in blue (and border states) with 626 in red Telephone area code 626 covers most of the San Gabriel Valley and nearby areas in the northeastern portion of Los Angeles County, California, including Arcadia, Monrovia, El Monte, most of Pasadena and West Covina. The area code was created in a split from 818 on June 14, 1997. [edit] Cities and Communities in the 626 area code [edit] See also [edit] External links | State of California Area Codes: 209, 213, 310, 323, 408, 415, 424, 510, 530, 559, 562, 619, 626, 650, 657, 661, 707, 714, 747, 760, 805, 818, 831, 858, 909, 916, 925, 949, 951 | | North: 661 | | | West: 323, 747/818 | area code 626 | East: 760, 909 | | South: 562, 657/714 | | |