Area code 510 covers the East Bay including Oakland, Berkeley, Fremont, and Hayward. Learn about coverage, time zone, and how to get a local 510 number.
Area code 510 serves the East Bay of the San Francisco Bay Area, covering much of Alameda County and western Contra Costa County. It shares its coverage area with overlay code 341. If you need a local presence in Oakland, Berkeley, or the East Bay, you can get a 510 phone number through Telnyx.
The 510 area code covers the East Bay — the eastern shore of the San Francisco Bay, from Richmond in the north to Fremont in the south.
| City | County | Population | Notes |
|---|---|---|---|
| Oakland | Alameda | ~430,000 | Largest city, Port of Oakland |
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| Fremont | Alameda | ~230,000 | Tech manufacturing hub |
| Hayward | Alameda | ~160,000 | Cal State East Bay |
| Berkeley | Alameda | ~125,000 | UC Berkeley |
| Richmond | Contra Costa | ~115,000 | North Bay, industrial |
| San Leandro | Alameda | ~90,000 | Between Oakland and Hayward |
| Alameda | Alameda | ~80,000 | Island city |
| Union City | Alameda | ~75,000 | South county |
| Newark | Alameda | ~48,000 | Near Fremont |
| Emeryville | Alameda | ~12,000 | Biotech, Pixar headquarters |
The region also includes Albany, Piedmont, El Cerrito, Hercules, Pinole, and San Pablo. For complete coverage details, see the NANPA area code map.
Area code 510 is in the Pacific Time Zone (PT). During standard time, this is UTC-8 (PST). During daylight saving time, it shifts to UTC-7 (PDT).
The 510 area code was created in 1991 when it split from the legendary 415 area code, which originally covered the entire Bay Area. The split gave the East Bay its own telephonic identity, separate from San Francisco.
The 510 quickly became a symbol of East Bay pride — celebrated in music, art, and local culture. In 2019, the 341 overlay was added to provide additional number capacity.
Today, 510 and 341 serve the same geographic area. New phone lines may be assigned either area code, and 10-digit dialing is required for all local calls. For regulatory details, visit the California Public Utilities Commission.
The East Bay is a major economic engine with strengths in technology, logistics, education, and healthcare:
Technology & Innovation
Logistics & Trade
Education & Research
Healthcare
A local 510 number helps businesses build trust with customers in this region. Calls from local area codes have higher answer rates than unfamiliar or toll-free numbers.
Telnyx offers local phone numbers in the 510 area code. You get:
Browse available 510 numbers or contact sales to discuss your needs.
| Area Code | Region | Major City | Relationship to 510 |
|---|---|---|---|
| 341 | East Bay | Oakland | Overlay (same area) |
| 415/628 | San Francisco | San Francisco | West (parent code) |
| 925 | Tri-Valley / East Contra Costa | Walnut Creek | East |
| 408/669 | South Bay | San Jose | South |
| 650 | Peninsula | San Mateo | Southwest |
| 707 | North Bay | Santa Rosa | North |
What area code is 510? Area code 510 serves the East Bay of the San Francisco Bay Area, including Oakland, Berkeley, Fremont, and Hayward.
What time zone is 510? Pacific Time (PT) — UTC-8 standard, UTC-7 during daylight saving.
Is 510 the same as 341? Yes, 341 is an overlay that covers the same geographic area as 510. Both area codes serve the East Bay.
Why is 510 culturally significant? The 510 has become a symbol of East Bay pride and identity since its creation in 1991, celebrated in local music, art, and culture as distinct from San Francisco 415.
