Located in the Pacific (GMT -08:00) time zone. Area code 916 serves the state of California. This area code was assigned on January 1st, 1947. On January 1st, 1947 it went into service. 916 is a General Purpose Code. 916 service area does overlap with 279 area codes. Dialing pattern for local calls within the same NPA (area code) is 7D.