626 Area Code – Pasadena, California: Location, Time Zone & History

In local food and culture media, the San Gabriel Valley is often simply called "the 626" — a shorthand that reflects one of the largest concentrations of Chinese American and broader Asian American communities in the United States. Cities such as San Gabriel, Monterey Park, Alhambra, and Rosemead anchor this identity, alongside Pasadena, the area's primary city and home to the Tournament of Roses Parade and Rose Bowl Game.

The 626 numbering plan area was carved out of area code 818 on June 14, 1997, taking the eastern San Gabriel Valley while 818 kept the San Fernando Valley. That split came just thirteen years after 818 itself had broken away from area code 213 in 1984, underscoring how fast telephone demand grew across the Los Angeles Basin. Ten-digit dialing became mandatory locally by October 2021, and a future overlay is anticipated as central-office codes approach exhaustion.

Beyond its cultural profile, the region is tied to Caltech and to institutions such as Huntington Hospital and the City of Hope National Medical Center campus in Duarte, giving 626 a mix of academic, medical, and community distinctiveness rarely found in a single numbering plan area.