510 area code: location, overlays and numbers
510, a US telephone area code, has served San Francisco, California since 1991 and shares an overlay with 341.
- Location
- San Francisco, California
- Service since
- 1991
- Local time zone
- Pacific time zone
- Overlay
- 341
- Calls within the area
- Dial 1, then the 10-digit number
- Rate centre list
- 13
- Exhaust, projected
- 2073
- Code for the country
- +1 (United States)
Source: NANPA public reports, the area code report and the rate-centre report; the file is dated 11/01/2026. The exhaust year comes from NANPA projections 2026-1 (April 2026). We are not an official NANPA site.
Get your own 510 number
There are two routes to a 510 number. A new number comes with a provider plan, and you select it at sign-up from the pool of numbers that provider holds in the code. Numbers a seller already has, often with a pattern, go up for a one-time price; after that you move the number over to a provider.
Providers ranked by first-year cost
| Provider | Cheapest plan | First year | Link |
|---|---|---|---|
 Free app | Basic (Just for me), free | $0 | Open Google Voice |
 Free app | Free plan, free | $0 | Open TextNow |
 Developer API | Pay-as-you-go local number, $1.15 a month | $13.80 | Open Twilio |
 Second-number app | Standard, $3.99 a month billed yearly | $47.99 | Open Burner |
 Toll-free specialist | Solo, $6.99 a month billed yearly | $84 | Open UniTel Voice |
 Second-number app | Deluxe (local number), $6.99 a month billed yearly | $102.88 | Open GoDaddy Conversations (formerly Smartline) |
Sellers listing local numbers
| Seller | What it sells | Listed price | Monthly fee | Link |
|---|---|---|---|---|
 Marketplace | Local numbers | From $9 one-time | None stated | Search at Exclusive Digits |
 Marketplace | Local and toll-free | From $9.95 one-time | $2.99 a month | Search at NumberBarn |
 Number broker | Local and toll-free | From $99 one-time | None stated | Search at RingBoost |
 Number broker | Local and toll-free | From $100 one-time | None stated | Search at PhoneNumberExpert |
| 212areacode.comNumber broker | Local numbers | From $150 one-time | None stated | Search at 212areacode.com |
Some sellers and providers may pay us a referral fee. The order stays by first-year cost, and a referral fee never changes it. How we earn
Places in the 510 area code
For 510, NANPA lists 13 rate centres. Each one is a local calling area where numbers get assigned:
Crockett, El Sobrante-pinole, Fremont-newark:greenleaf Da, Fremont-newark:main Da, Fremont-newark:oliver Da, Hayward, Hercules-rodeo, Oakland:alameda Da, Oakland:berkeley Da, Oakland:fruitvale Da, Oakland:main-piedmont Da, Oakland:trinidad Da, Richmond.
Other related area codes
The same area and the same pool of numbers: 341. Any of these codes can supply a new number in this area, so ask for the one you want.
The other California area codes are: 213, 415, 916, 714, 805, 209, 408, 707, 619, 818, 310, 909, 562, 760, 626, 650, 530, 925, 949, 323, 831, 559, 661, 858, 951, 424, 657, 747, 442, 669, 628, 279, 820, 840, 350, 369, 738, 837 and 357.
510 area code questions
Which places does area code 510 cover?
In San Francisco, California, a 510 number rings in the San Francisco-Oakland-Fremont, CA area.
Which country code does a 510 number use?
+1. Because 510 belongs to the North American Numbering Plan, calling from abroad means dialing +1 510 and the 7-digit number.
What time is it in the 510 area code?
Pacific time is the time zone for 510.
Who uses a 510 number to call?
Callers with a number in this code include homes, mobiles, local businesses, and people who fake a local number. When a 510 number appears on your screen, it points to where the number was assigned, not to who is calling.