---
title: "Area code 650: California, United States"
url: "https://lookvalid.com/area-code/650.md"
canonical_url: "https://lookvalid.com/area-code/650"
last_updated: "2026-10-23"
type: "reference"
summary: "Area code 650 serves California, United States. Number formats, numbering rules, a live phone validator and the other codes in California."
---

# Area code 650: California, United States

Area code 650 serves California, United States. Number formats, numbering rules, a live phone validator and the other codes in California.

NANPA lists 710 central office codes (prefixes) in use in area code 650, held by 35 holders across 15 rate centers.
Pacific Bell holds the most prefixes, 272 (38%). 72% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
The FCC unwanted-call data has 3,558 complaints on file for 2,675 numbers in 650, most often filed as "Unwanted Calls". These are consumer reports, not findings.

## Facts

- 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

| 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% |

## Carriers

| 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.

## History

- 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.

## Nearest area codes

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).

## ZIP codes

19 ZIP codes fall in places that have a rate center in this area code. The places with the most are Palo Alto, CA (6 ZIP codes), San Mateo, CA (5 ZIP codes) and Los Altos, CA (3 ZIP codes). A ZIP code and an area code are unrelated systems, so a ZIP code can sit in more than one area code and an area code spans many ZIP codes.

## Complaints on file

3,558 complaints for 2,675 numbers. Numbers whose latest complaint falls in each year:

- 2023: 286
- 2024: 136
- 2025: 78

## Questions

### 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.

Sources: NANPA central office code report dated 2026-10-17; NANPA NPA report dated 2026-10-18; FCC unwanted-call complaints, data fetched 2026-10-17; ZIP code places from GeoNames (CC BY 4.0).