Area Code 510
Area code 510 covers Oakland, California (Pacific Time) and nearby Fremont, Hayward and Berkeley; overlay 341 shares the same area.
Area code 510 quick facts
| Location | Oakland, California |
|---|---|
| Time zone | Pacific Time |
| In service | 1991-09-02 |
| Overlay codes | 341 |
| Nearby codes | 341, 408, 669, 650, 925, 209 |
| Carrier coverage | 786 prefixes; 39% wireless |
| FTC complaint data | 283 complaints across 76 numbers |
| Data current as of | November 2, 2026 |
Is a call from 510 a scam? Who called me from 510?
FTC complaints involving 510 numbers
Numbers shown with area code 510 in the FTC's Do Not Call “Reported Calls” database (recent reporting window). Most common reported reasons: “Other”, “Dropped call or no message”, “Calls pretending to be government, businesses, or family and friends”.
Most-complained 510 numbers:
- (510) 890-4412 — 11 complaints
- (510) 746-6730 — 9 complaints
- (510) 754-1263 — 8 complaints
- (510) 595-4592 — 7 complaints
- (510) 736-0001 — 6 complaints
These are FTC Do Not Call complaints filed about specific numbers shown with this area code — frequently spoofed. The area code itself is not a scam. See the most-reported area codes and the most-reported phone numbers nationwide.
Cities in area code 510
Oakland, Fremont, Hayward, Berkeley, Richmond, San Leandro, Alameda, Union City, Newark, Castro Valley, El Cerrito, San Lorenzo
Area codes by city
- Oakland area codes
- Berkeley area codes
- Fremont area codes
- Hayward area codes
- Union City area codes
- Alameda area codes
- San Leandro area codes
Carriers in area code 510
Area code 510 spans 786 prefixes, about 39% wireless. Top carriers: PACIFIC BELL, T-MOBILE USA, INC., METROPCS, INC., ONVOY, LLC - CA. Look up the carrier and line type for a 510 number.
Other California area codes
- 209 — Stockton
- 213 — Los Angeles
- 279 — Sacramento
- 310 — Compton
- 323 — Los Angeles
- 341 — Oakland
- 350 — Stockton
- 357 — Fresno
- 369 — Santa Rosa
- 408 — San Jose
- 415 — San Francisco
- 424 — Compton
- 442 — Victorville
- 530 — Marysville
- 559 — Fresno
- 562 — Long Beach
- 619 — San Diego
- 626 — Alhambra
- 628 — San Francisco
- 650 — Palo Alto
- 657 — Anaheim
- 661 — Bakersfield
- 669 — San Jose
- 707 — Santa Rosa
- 714 — Anaheim
- 738 — Los Angeles
- 747 — San Fernando
- 760 — Oceanside
- 805 — Oxnard
- 818 — Van Nuys
- 820 — Camarillo
- 831 — Salinas
- 837 — Redding
- 840 — Pomona
- 858 — San Diego
- 909 — Ontario
- 916 — Sacramento
- 925 — Concord
- 949 — Irvine
- 951 — Riverside
Nearby area codes
Frequently asked questions
Where is area code 510?
Area code 510 covers Oakland, California (Pacific Time) and nearby Fremont, Hayward and Berkeley; overlay 341 shares the same area.
What cities use area code 510?
Area code 510 serves Oakland, Fremont, Hayward, Berkeley, Richmond, and 8 other communities in California.
What time zone is area code 510 in?
Area code 510 is in the Pacific Time (America/Los_Angeles).
How do you dial a 510 number?
Dial all 10 digits: 510 followed by the 7-digit local number. From abroad, dial +1 510 and the local number.
Is a call from area code 510 a scam?
A 510 number is geographically tied to California, but caller ID can be spoofed, so the displayed area code does not prove where a caller really is. If you did not expect the call, do not share personal information and consider looking the number up.
Is 510 a country code?
No. 510 is a US area code (a domestic 3-digit code), not a country code. The country (calling) code for the United States is +1, shared across the North American Numbering Plan. So a full 510 number written for international dialing looks like +1 510 followed by the 7-digit local number.
Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of November 2, 2026. Refreshed monthly.