Area Code Atlas

NPA 650 split from 415 for San Mateo County in 1997

Area code 650 was created on August 2, 1997, as a geographic split from area code 415, covering most of San Mateo County, parts of San Francisco, and the northwestern Santa Clara County, including Palo Alto and Mountain View.

Extraordinary Jeopardy Procedures for 650 NPA in California

NANP- Overlay of 650 Numbering Plan Area (NPA) with 764 NPA - California

Suspension of overlay relief for 408 and other NPAs

On December 16, 1999, the California Public Utilities Commission suspended the implementation of planned overlays for area codes 408, 415, 510, 650, 714, and 909. This action was taken due to the adoption of telephone number pooling, which delayed the need for additional area codes.

Overlays Suspended in the 408, 415, 510, 650, 714 & 909 NPAs

NPA 415, 619, 650, 707 - Relief Plans Dismissed (California)

Permissive 10-digit dialing begins in 650

Permissive 10-digit dialing began in area code 650 on April 24, 2021, allowing both 7-digit and 10-digit dialing as part of the transition required by the designation of 988 as the National Suicide Prevention Lifeline code.

Mandatory 10-digit dialing in 650

Mandatory 10-digit dialing was implemented in area code 650 on October 24, 2021, following the nationwide adoption of 988 as a 3-digit code for the National Suicide Prevention Lifeline. Seven-digit dialing was discontinued to resolve conflicts with the new 988 code.