Cities in area code 510
Area code 510 serves 13 localities in California, led by Oakland:main-piedmont Da, Hayward, Fremont-newark:main Da. The table lists every rate center — the billing locality each prefix is anchored to — with its share of the code's 784 active prefixes.
By numbering footprint the leading localities are Oakland:main-piedmont Da, Hayward, Fremont-newark:main Da, Oakland:berkeley Da, Oakland:trinidad Da, Richmond, Fremont-newark:oliver Da and Oakland:alameda Da, and 4 smaller communities down to single-prefix localities. Prefix counts track lines in service, so the ranking is a reasonable proxy for where the code's subscribers actually are.
Metropolitan coverage: 13 rate centers belong to FCC top-100 metro areas.
Overlap note: 13 localities are shared with other area codes, so a neighbor's number may differ in its first three digits.
Clock-wise the coverage is Pacific.
A caller's real location can differ: numbers port between carriers and follow their owners when they move. Use the prefix tables to see where a specific number block was issued.
| Locality (rate center) | Active prefixes | Metro area | All codes serving it |
|---|---|---|---|
| Oakland:main-piedmont Da | 204 | San Francisco-Oakland-Fremont, CA | 341, 510 |
| Hayward | 116 | San Francisco-Oakland-Fremont, CA | 341, 510 |
| Fremont-newark:main Da | 81 | San Francisco-Oakland-Fremont, CA | 341, 510 |
| Oakland:berkeley Da | 70 | San Francisco-Oakland-Fremont, CA | 341, 510 |
| Oakland:trinidad Da | 60 | San Francisco-Oakland-Fremont, CA | 341, 510 |
| Richmond | 53 | San Francisco-Oakland-Fremont, CA | 341, 510 |
| Fremont-newark:oliver Da | 45 | San Francisco-Oakland-Fremont, CA | 341, 510 |
| Oakland:alameda Da | 42 | San Francisco-Oakland-Fremont, CA | 341, 510 |
| Oakland:fruitvale Da | 39 | San Francisco-Oakland-Fremont, CA | 341, 510 |
| El Sobrante-pinole | 28 | San Francisco-Oakland-Fremont, CA | 341, 510 |
| Fremont-newark:greenleaf Da | 25 | San Francisco-Oakland-Fremont, CA | 341, 510 |
| Hercules-rodeo | 14 | San Francisco-Oakland-Fremont, CA | 341, 510 |
| Crockett | 7 | San Francisco-Oakland-Fremont, CA | 341, 510 |
FAQ
What is the biggest city in area code 510?
Oakland:main-piedmont Da holds the most active prefixes (204), making it the code's largest numbering locality.
How many places does 510 cover?
13 rate centers in California hold active 510 prefixes, from Oakland:main-piedmont Da down to communities with a single prefix.
Does a 510 number guarantee the caller lives in one of these places?
No — the tables show where number blocks were issued. Porting and VoIP let people keep or acquire numbers anywhere.