Located in the Pacific (GMT -08:00) time zone. Area code 669 serves the state of California. This area code was assigned on November 20th, 1998. On November 20th, 2012 it went into service. 669 is a General Purpose Code. 669 service area does overlap with 408 area codes. Dialing pattern for local calls within the same NPA (area code) is 1+10D.