650 area code — Palo Alto, CA geographic
- State
- California
- Major area
- Palo Alto
- Time zone
- Pacific
- In service since
- 1997-08-02
- Split from
- 415
- Active prefixes
- 707
- Rate centers
- 15
- Carriers
- 36
- Projected exhaust
- 3Q 2039
Area code 650 is a geographic code serving Palo Alto, California in the Pacific time zone. It has been in service since August 2, 1997. Note that porting and VoIP mean a 650 number can be used from anywhere — the code marks where the number was assigned.
707 central-office prefixes are currently active in this code, spread across 36 code-holding carriers. Thousands-block pooling applies to 509 prefixes, so a single prefix can belong to several carriers. Its prefixes map to 15 distinct rate centers.
650 was created from 415 in 1997.
NANPA projects numbering capacity to exhaust in 3Q 2039.
Dialing: 1+10D locally, 1+10D to other codes.
Use this page to decode where 650 numbers come from — and remember that spoofing means the screen can lie about everything except your own caution.
Largest localities in 650
| Locality (rate center) | Active prefixes | Also served by |
|---|---|---|
| Palo Alto | 144 | — |
| San Mateo | 125 | — |
| Mountain View | 91 | — |
| South San Francisco | 88 | — |
| Redwood City | 64 | — |
| San Carlos-belmont | 43 | — |
| Los Altos | 28 | — |
| Millbrae | 24 | — |
| San Francisco:juniper Da | 22 | 415, 628 |
| Half Moon Bay | 20 | — |
FAQ
Where is a 650 number from?
650 is assigned to Palo Alto and surrounding areas of California in the Pacific time zone. The three digits after the area code (the prefix) narrow it down to a rate center.
Is 650 a toll-free number?
No. 650 is a geographic code; calls are billed like any other domestic call. Toll-free codes are 800, 833, 844, 855, 866, 877 and 888.
Will 650 run out of numbers?
NANPA's current forecast projects exhaust in 3Q 2039 — decades of capacity remain.