Area code
Area code 650 — San Mateo & Palo Alto, CA
California · in service since August 2, 1997
Area code 650 covers San Mateo & Palo Alto, CA. It was created from area code 415 on August 2, 1997 and no other code overlays it.
Local time in San Mateo & Palo Alto
Spam reports from Sep 23 – Oct 22, 2026
Average #150 of 461 codes
588 FTC complaints
Consumer reports, not verified by the FTC.
See the reports- Time zonePacific Time
- Local calls1 + 10 digits
- Prefixes731 assigned
- Runs out~3Q 2039
- Unwanted call?Block & report
Spam call reports about 650 numbers
Complaints by week
Sep 11 – Oct 22, 2026Show as table
| Week starting | Complaints |
|---|---|
| Sep 7 (3 days) | 31 |
| Sep 14 | 138 |
| Sep 21 | 119 |
| Sep 28 | 117 |
| Oct 5 | 135 |
| Oct 12 | 150 |
| Oct 19 (4 days) | 117 |
Compared with all codes
- Robocalls
- 67%all codes 75%
- Callers with the same code
- 30%all codes 35%
- Rank by complaints
- #150of 461 · middle half
- FCC complaints, Oct 2025 – Sep 2026
- 14115 about text messages
What the calls were about
Sep 11 – Oct 22, 2026
| Subject | Complaints | |
|---|---|---|
| Calls pretending to be government, businesses, or family and friends | 166 21% | |
| Reducing your debt (credit cards, mortgage, student loans) | 131 16% | |
| Dropped call or no message | 75 9% | |
| Computer & technical support | 27 3% | |
| Energy, solar, & utilities | 10 1% | |
| Home improvement & cleaning | 10 1% |
Where the people who complained live
Sep 11 – Oct 22, 2026
| State | Complaints | |
|---|---|---|
| California | 401 50% | |
| Florida | 39 5% | |
| New York | 32 4% | |
| Texas | 29 4% | |
| Pennsylvania | 24 3% |
October 2026 (partial) report · most reported
Consumer reports, not verified by the FTC · source
Source: FTC Do Not Call complaints created Sep 11 – Oct 22, 2026. They are reported by consumers and are not verified by the FTC; caller ID can be spoofed (how we count).
Source: FCC Consumer Complaints data, unwanted calls filed Oct 1, 2025 – Sep 30, 2026, by caller ID; not verified by the FCC.
Area code 650 location and prefixes
| Exchange (NANPA) | Place | County | Prefixes |
|---|---|---|---|
| PALO ALTO | Palo Alto | Santa Clara County | 145 |
| SAN MATEO | San Mateo | San Mateo County | 126 |
| MT VIEW | Mountain View | Contra Costa County | 93 |
| SSNFRNCSCO | South San Francisco | San Mateo County | 89 |
| REDWOOD CY | Redwood City | San Mateo County | 65 |
| SNCRL-BLMT | — | — | 44 |
| LOS ALTOS | Los Altos | Santa Clara County | 28 |
| MILLBRAE | Millbrae | San Mateo County | 24 |
| SNFC JUNPR | San Francisco | San Francisco County | 22 |
| HALFMOONBY | Half Moon Bay | San Mateo County | 21 |
Plus 6 smaller exchange areas.
Source: NANPA CO codes of Oct 23, 2026; places: U.S. Census Bureau, matched by DialWhere (how).
NANPA record
- Location
- California
- Assigned by NANPA
- November 22, 1996
- Created from
- 415
- Local dialing
- 1 + 10 digits (NANPA: 1+10D)
- NANPA planning letters
- PL-556, PL-544, PL-421, PL-206, PL-193, PL-129, PL-071, PL-022
Source: NANPA, NPA database of Oct 24, 2026.
Is 650 running out of numbers?
Previous forecast (October 2025): 2039, the same year.
Forecast exhaust year by edition
Source: NANPA NRUF forecast, April 2026 edition.
Who holds 650 prefixes
The five largest of 37 original holders
As listed by NANPA, not today’s carrier.
| Holder (as listed) | Prefixes | |
|---|---|---|
| Pacific Bell | 273 37% | |
| New Cingular Wireless PCS, LLC | 59 8% | |
| Mcimetro Access Transmission Services LLC | 57 8% | |
| T-Mobile USA, Inc. | 57 8% | |
| Onvoy, LLC | 45 6% |
Source: NANPA CO codes of Oct 23, 2026.
Questions about area code 650
What area code is 650?
A California area code, in service since August 2, 1997.
Where is 650 area code, and what time zone is it in?
San Mateo & Palo Alto, CA; Pacific Time.
Why am I getting spam calls from 650?
588 FTC complaints from Sep 23 – Oct 22, 2026, most often about impostors (not verified by the FTC; caller ID can be spoofed).
Will 650 get a new area code?
NANPA forecasts exhaust in 3Q 2039; no relief planning listed.