Area code
650
650 is a United States area code. Under the North American Numbering Plan it belongs to California, which has 41 area codes in total.
Validate a number in 650
Paste a full number and the tool checks it against the numbering plan. It returns the standard formats, the line type the plan assigns and the area code region.
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Area code 650 at a glance
NANPA lists 710 central office codes (prefixes) in use in area code 650, held by 35 holders across 15 rate centers.
| Fact | Value |
|---|---|
| In service since | 1997-08-02 |
| Time zone | Pacific (P) |
| Prefixes in use | 710 |
| Pooled prefixes | 512 (72%) |
| Rate centers | 15 |
| Companies holding prefixes | 35 |
| Assignment dates on file | 2001-01-25 to 2026-08-19 (164 prefixes) |
| ZIP codes in its places | 19 |
Rate centers in area code 650
| Rate center | Prefixes | Share |
|---|---|---|
| PALO ALTO | 145 | 20% |
| SAN MATEO | 125 | 18% |
| MT VIEW | 92 | 13% |
| SSNFRNCSCO | 88 | 12% |
| REDWOOD CY | 64 | 9% |
| SNCRL-BLMT | 44 | 6% |
| LOS ALTOS | 28 | 4% |
| MILLBRAE | 24 | 3% |
| 7 other rate centers | 100 | 14% |
Who holds the prefixes in 650
Pacific Bell holds the most prefixes, 272 (38%). 72% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
| Holder | Prefixes | Share |
|---|---|---|
| Pacific Bell | 272 | 38% |
| New Cingular Wireless PCS | 59 | 8% |
| Mcimetro Access Transmission Services | 57 | 8% |
| T-Mobile USA | 57 | 8% |
| Level 3 Communications | 42 | 6% |
| Onvoy | 40 | 6% |
| 29 other carriers | 183 | 26% |
A prefix holder is the company a code was assigned to, not necessarily a number's current carrier, because numbers can be ported to another company. Find which carrier a number is on, or browse the prefix holders.
History of area code 650
- 1947-01-01 Area code 415, named as the parent of 650 in the NANPA report, was in service.
- 1997-08-02 Area code 650 went into service.
Area codes nearest to 650
Distance is measured between the centers of the ZIP code places each area code serves, so it is a rough guide.
ZIP codes in area code 650
19 ZIP codes fall in places that have a rate center in this area code.
| Place | ZIP codes |
|---|---|
| Palo Alto, CA | 6 |
| San Mateo, CA | 5 |
| Los Altos, CA | 3 |
A ZIP code and an area code are unrelated systems. A ZIP code can sit in more than one area code, and an area code spans many ZIP codes.
Complaints on file for 650 numbers
3,558 FCC complaints are on file for 2,675 numbers in 650, most often filed as "Unwanted Calls". These are unverified consumer reports.
| Year of latest complaint | Numbers |
|---|---|
| 2023 | 286 |
| 2024 | 136 |
| 2025 | 78 |
Other area codes in California
California is one state with 41 area codes in the NANPA table. 650 is one of them.
- 209
- 213
- 279
- 310
- 323
- 341
- 350
- 357
- 369
- 408
- 415
- 424
- 442
- 510
- 530
- 559
- 562
- 619
- 626
- 628
- 657
- 661
- 669
- 707
- 714
- 738
- 747
- 760
- 805
- 818
- 820
- 831
- 837
- 840
- 858
- 909
- 916
- 925
- 949
- 951
Next to 650 in the numbering table
These are the codes just before and after 650 when all are sorted by number. They are neighbours on the list, not necessarily on the map.
What the area code does and does not tell you
A number that starts with 650 was first assigned in California. That is a fact about where the number began, and it is a useful hint when you check a form entry, for example a billing address in California next to a 650 phone number.
It does not show where the person is today. A number stays with its owner after a move or a change of provider (number portability), and mobile numbers travel with the handset. The area code also cannot tell you whether the line is active, who the carrier is, or whether the number is mobile or fixed: the plan shares those ranges. Read more about the area code, the numbering plan and line type.
Check numbers in bulk with the API
| Product | Credits | Docs |
|---|---|---|
| Phone Numbering-Plan Validation | 1 credit per valid number | API docs |
| Phone Intelligence (carrier and line status) | 1 credit per check (invalid numbers outside the US and Canada are free) | Product page |
Questions about area code 650
Where is area code 650?
NANPA assigns area code 650 to California, United States.
In which state does area code 650 sit?
California. 650 is one of 41 area codes the NANPA table assigns to the state.
Which places does area code 650 cover?
The places with the most ZIP codes among the rate centers in 650 are Palo Alto, CA, San Mateo, CA and Los Altos, CA. The rate center list on this page shows all of them.
Who owns area code 650?
NANPA assigns area codes. Within 650, Pacific Bell holds the most prefixes, 272 prefixes or 38%.
Which time zone does 650 use?
The NANPA NPA report lists the time zone for 650 as Pacific (P).
What year did 650 enter service?
The NANPA NPA report gives an in-service date of 1997-08-02, so 650 has been in use since 1997.
Does area code 650 have an overlay?
The NANPA NPA report lists no other area code in an overlay with 650.
Which area codes are nearest to 650?
The area codes closest to 650, measured between the centers of the ZIP code places they serve, are 341 (about 25 miles), 510 (about 25 miles), 669 (about 25 miles), 925 (about 33 miles) and 408 (about 38 miles).
How many prefixes does area code 650 have?
NANPA's report dated 2026-10-17 lists 710 prefixes in service in 650, spread over 15 rate centers and 35 holders.
Are there complaints about 650 numbers?
The FCC data on file has 3,558 complaints for 2,675 numbers in 650. They are unverified consumer reports. A number with no complaints on file is not proven safe.
Area code assignments: North American Numbering Plan Administrator NPA report, file dated 10/17/2026, retrieved 2026-10-17. Source file. New codes are assigned several times a year. Prefixes, rate centers, holders, time zone, in-service date and overlays: NANPA central office code report dated 2026-10-17 and NPA report dated 2026-10-18. Complaints: FCC consumer complaints open data, fetched 2026-10-17. ZIP code places: Postal code places and coordinates: GeoNames (geonames.org), licensed CC BY 4.0.