The 650 area code is one of 82 across the country making the switch. In California, you may also need to dial 1 before the area code, according to the FCC.

415 area code near full; 628 on the way AREA CODES S.F. stalwart for 65 years, 415's reign is numbered By Will Kane, Reporter Updated Dec 14, 2012 8:53 a.m.

For 650, 831 and 925, undoubtedly those area codes have many fine qualities that are known to the people who live there. The process of assigning area codes remains cloaked in mystery.

In 1959, the state carved two new area codes - 707 and 408 - from 415's territory. The 510 code followed in 1991, 650 in 1997. The numbers came to mean different places, with different identities.