Area code 510 — California
Area code 510 is in California and serves Fremont, Hayward, Richmond, Berkeley. Time zone, overlays, counties and ZIP codes.
| Location | California (coastal regions of the East Bay: Oakland, Fremont, Hayward, Richmond, Berkeley, and Alameda) |
|---|---|
| Main places | Fremont, Hayward, Richmond, Berkeley, Alameda |
| State | California |
| Status | In service · since 1991 |
| Time zone | Pacific · |
| Overlay codes | 341 Overlays share the same area. Local calls usually need 10-digit dialing. |
| Local dialing | 1+10D |
History
- Used until 1981 for TWX service
- Split of 415
- 1998: split to create 925
- 2019: overlaid by 341
Counties (approximate)
AlamedaAlameda CountyContra CostaContra Costa CountyMarinMarin CountySan Francisco CountySanta ClaraSanta Clara County
ZIP codes in area code 510
Approximate: area code boundaries follow telephone rate centers, not ZIP codes.
94105 San Francisco94111 San Francisco94130 San Francisco94501 Alameda94502 Alameda94516 Canyon94530 El Cerrito94536 Fremont94538 Fremont94539 Fremont94541 Hayward94542 Hayward94543 Hayward94544 Hayward94545 Hayward94546 Castro Valley94547 Hercules94550 Livermore94552 Castro Valley94555 Fremont94560 Newark94563 Orinda94564 Pinole94577 San Leandro94578 San Leandro94579 San Leandro94580 San Lorenzo94586 Sunol94587 Union City94601 Oakland94602 Oakland94603 Oakland94604 Oakland94605 Oakland94606 Oakland94607 Oakland94608 Emeryville94609 Oakland94610 Oakland94611 Oakland
Format a 510 number
US numbers are written as (510) 555-0123 or 510-555-0123. From outside the US, dial +1 510 555 0123.
Is a call from 510 a scam?
An area code only tells you where a number was assigned. Caller ID can be faked (“spoofed”), so do not trust a call just because the area code looks local. Never share codes or payment details with unexpected callers.
Sources: NANPA via NumberResearch.org (CC BY 4.0); place names and history from Wikipedia (CC BY-SA 4.0). See data sources.