Area code
Area code 510 — Oakland, CA
California · in service since September 2, 1991
Area code 510 covers Oakland, CA. It is an overlay: 341 serves the same area, so neighbors can have different area codes.
Overlay, same area: 341
Local time in Oakland
Spam reports from Sep 23 – Oct 22, 2026
Average #121 of 461 codes
657 FTC complaints
Consumer reports, not verified by the FTC.
See the reports- Time zonePacific Time
- Local calls1 + 10 digits
- Prefixes800 assigned
- Runs out~4Q 2073
- Unwanted call?Block & report
Spam call reports about 510 numbers
Complaints by week
Sep 11 – Oct 22, 2026Show as table
| Week starting | Complaints |
|---|---|
| Sep 7 (3 days) | 32 |
| Sep 14 | 103 |
| Sep 21 | 104 |
| Sep 28 | 137 |
| Oct 5 | 166 |
| Oct 12 | 172 |
| Oct 19 (4 days) | 121 |
Compared with all codes
- Robocalls
- 58%all codes 75%
- Callers with the same code
- 35%all codes 35%
- Rank by complaints
- #121of 461 · middle half
- FCC complaints, Oct 2025 – Sep 2026
- 8815 about text messages
What the calls were about
Sep 11 – Oct 22, 2026
| Subject | Complaints | |
|---|---|---|
| Dropped call or no message | 115 14% | |
| Reducing your debt (credit cards, mortgage, student loans) | 95 11% | |
| Calls pretending to be government, businesses, or family and friends | 75 9% | |
| Energy, solar, & utilities | 33 4% | |
| Home improvement & cleaning | 26 3% | |
| Medical & prescriptions | 18 2% |
Where the people who complained live
Sep 11 – Oct 22, 2026
| State | Complaints | |
|---|---|---|
| California | 606 73% | |
| Florida | 14 2% | |
| New York | 12 1% | |
| Tennessee | 12 1% | |
| Texas | 12 1% |
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 510 location and prefixes
| Exchange (NANPA) | Place | County | Prefixes |
|---|---|---|---|
| OKLD MN-PD | Oakland | Alameda County | 205 |
| HAYWARD | Hayward | Alameda County | 117 |
| FRNK MAIN | — | — | 81 |
| OKLD BKLY | Berkeley | Alameda County | 70 |
| OKLD TRNID | Oakland | Alameda County | 60 |
| RICHMOND | Richmond | Contra Costa County | 53 |
| FRNK OLIVR | — | — | 45 |
| OKLD ALMD | Alameda | Alameda County | 42 |
| OKLD FRTVL | Oakland | Alameda County | 39 |
| ELSBR-PINL | — | — | 28 |
Plus 3 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
- April 25, 1990
- Created from
- 415
- Local dialing
- 1 + 10 digits (NANPA: 1+10D)
- NANPA planning letters
- PL-518, PL-413, PL-206, PL-190
Source: NANPA, NPA database of Oct 24, 2026.
Is 510 running out of numbers?
Previous forecast (October 2025): 2068, moved later by 5 years.
Forecast exhaust year by edition
Source: NANPA NRUF forecast, April 2026 edition.
Who holds 510 prefixes
The five largest of 33 original holders
As listed by NANPA, not today’s carrier.
| Holder (as listed) | Prefixes | |
|---|---|---|
| Pacific Bell | 278 35% | |
| New Cingular Wireless PCS, LLC | 78 10% | |
| T-Mobile USA, Inc. | 65 8% | |
| Verizon Wireless | 60 8% | |
| Mcimetro Access Transmission Services LLC | 48 6% |
Source: NANPA CO codes of Oct 23, 2026.
Questions about area code 510
What area code is 510?
A California area code, in service since September 2, 1991.
Where is 510 area code, and what time zone is it in?
Oakland, CA; Pacific Time.
Why am I getting spam calls from 510?
657 FTC complaints from Sep 23 – Oct 22, 2026, most often about dropped calls or no message (not verified by the FTC; caller ID can be spoofed).
Will 510 get a new area code?
NANPA forecasts exhaust in 4Q 2073; no relief planning listed.