CALIFORNIA · AREA CODE GUIDE
510 area code location: Hayward and Berkeley, California
- Local date and time
- Pacific Time
Map data: HSIP (2010) · NANPA · US Census Bureau, checked 26 September 2026. Boundaries are approximate.
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Download the 510 area code map
A printable area code 510 location map, with time zone and state. Use the PNG image in a document or slide; the SVG stays sharp at any size.
510 area code at a glance
- State
- California
- Primary cities
- Hayward, Berkeley, and Richmond
- Established
- Population
- Largest community: Hayward, 157,113 (2025)Not an area-code population.
- Prefixes in service
- 784 as of 13 October 2026
An area code does not show where a caller is now.
History
Country and calling code: United States (+1).
Parent code: 415.
New code planned: No, as of 22 September 2026.
Time zone
- Pacific Time
- Standard time UTC−08:00
- Daylight saving time UTC−07:00
Counties and cities covered
510 numbers are issued across 13 communities. These are telephone exchange areas, which follow the phone network rather than city limits, so a place can sit just outside the boundary of the town it is named for.
Counties of the communities we could place (the code may reach further): Alameda County and Contra Costa County.
- Hayward
- Berkeley
- Richmond
- Alameda
- Crockett
- El Sobrante-Pinole
- Fremont-Newark
- Fruitvale
- Greenleaf
- Hercules-Rodeo
- Main-Piedmont
- Oliver
- Trinidad
Notable places in 510
| Place | Where | What it is |
|---|---|---|
| University of California, Berkeley | 3.6 km from Berkeley | University, 48,556 12-month enrollment (2023–24) |
| University of California | 6.7 km from Alameda | University |
| Oakland San Francisco Bay Airport | 4.2 km from Alameda | Commercial airport, 5,292,736 enplanements (2024) |
| Oakland Arena | 5.1 km from Alameda | Arena |
| California College of the Arts | 5.4 km from Berkeley | University, 1,632 12-month enrollment (2023–24) |
| Oakland Museum of California | 6.3 km from Alameda | Museum |
| Oakland Seaport | 6.3 km from Alameda | Port |
| Naval Air Station Alameda | 7.1 km from Alameda | Military base |
| California Memorial Stadium | 4.2 km from Berkeley | Stadium |
| Hayward Executive Airport | 3.9 km from Hayward | Airport |
Also serving this area
Questions about 510
Where is the 510 area code?
510 is in California. Its numbers are issued in Hayward, Berkeley, Richmond, and 10 other communities.
What time zone is area code 510 in?
510 is in Pacific Time. Daylight saving time is observed.
Does 510 have an overlay?
Yes. 341 was added as an overlay on 510 on 22 July 2019.
What cities are in the 510 area code?
Hayward, Berkeley, Richmond, Alameda, and Crockett, and 8 other communities.
What state is area code 510 in?
Area code 510 is in California.
What counties are covered by area code 510?
Area code 510 covers communities in Alameda County and Contra Costa County.
Is 510 a toll-free area code?
No. 510 is a geographic area code. The toll-free codes are 800, 833, 844, 855, 866, 877, and 888.
Sources: NANPA area code listing, NANPA places by area code, NANPA central office code assignments, U.S. Census Bureau population estimates, OMB metropolitan area delineations. Checked .
Business phone numbers in area code 510, answered by an AI agent
A local number for Hayward, Berkeley, and Richmond, California, with an AI receptionist that takes caller details, answers the questions you give it, and books appointments. Numbers depend on what carriers have left.