Area code 626 is a telephone area code that was split from area code 818 in the U.S. state of California, on June 14, 1997. It covers most of the San Gabriel Valley and nearby areas in the northeastern portion of Los Angeles County, California, U.S., including Arcadia, Monrovia, El Monte, most of Pasadena and West Covina. Prior to October 2021, area code 626 had telephone numbers assigned for the central office code 988. In 2020, 988 was designated nationwide as a dialing code for the National Suicide Prevention Lifeline, which created a conflict for exchanges that permit seven-digit dialing. This area code was therefore scheduled to transition to ten-digit dialing by October 24, 2021. Cities and communities in the 626 area code Alhambra (small portion in the 213/323 area code) Altadena Arcadia Avocado Heights Azusa Baldwin Park Bassett Bradbury Charter Oak Citrus Covina Duarte East Pasadena East San Gabriel El Monte Glendora (small portion in the 909 area code) Hacienda Heights (small portion in the 562 area code) Industry (small portions in the 562 and 909 area codes) Irwindale La Puente Mayflower Village Monrovia Monterey Park (also in the 213/323 area code) North El Monte Pasadena (small portion in the 213/323 area code) Rosemead (small portion in the 213/323 area code) Rowland Heights (also in the 909 area code and small portion in the 562 area code) San Gabriel San Marino Sierra Madre South El Monte South Pasadena (also in the 213/323 area code) South San Gabriel South San Jose Hills Temple City Valinda Vincent Walnut (mostly in the 909 area code) West Covina (small portion in the 909 area code) West Puente Valley See also List of California area codes List of NANP area codes North American Numbering Plan References External links 626 Los Angeles County, California San Gabriel Valley Telecommunications-related introductions in 1997 626