CALIFORNIA · AREA CODE GUIDE
925 area code location: Concord and Antioch, 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 925 area code map
A printable area code 925 location map, with time zone and state. Use the PNG image in a document or slide; the SVG stays sharp at any size.
925 area code at a glance
- State
- California
- Primary cities
- Concord, Antioch, and Livermore
- Established
- Population
- Largest community: Concord, 123,261 (2025)Not an area-code population.
- Prefixes in service
- 637 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: 510.
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
925 numbers are issued across 17 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): Contra Costa County and Alameda County.
- Concord
- Antioch
- Livermore
- Pittsburg
- Pleasanton
- Walnut Creek
- Danville
- Martinez
- Lafayette
- Orinda
- Moraga
- Clayton
- Bishop Ranch
- Dublin-San Ramon
- East Contra Costa
- Pittsburg West
- Sunol
Notable places in 925
| Place | Where | What it is |
|---|---|---|
| Buchanan Field Airport | 5.1 km from Martinez | Airport |
| Livermore Municipal Airport | 5.4 km from Livermore | Airport |
| John F. Kennedy University | 5.0 km from Concord | University |
| John Muir National Historic Site | 1.8 km from Martinez | National Historic Site |
| Saint Mary's College of California | 1.3 km from Moraga | College, 3,108 12-month enrollment (2023–24) |
| Byron Airport | 19.7 km from Livermore | Airport |
| Diablo Valley College | 4.9 km from Martinez | College |
| Blackhawk Museum | 4.7 km from Danville | Museum |
| Port Chicago Naval Magazine National Memorial | 9.8 km from Concord | National Memorial |
| Ruth Bancroft Garden | 2.4 km from Walnut Creek | Botanical garden |
Questions about 925
Where is the 925 area code?
925 is in California. Its numbers are issued in Concord, Antioch, Livermore, and 14 other communities.
What time zone is area code 925 in?
925 is in Pacific Time. Daylight saving time is observed.
What cities are in the 925 area code?
Concord, Antioch, Livermore, Pittsburg, and Pleasanton, and 12 other communities.
What state is area code 925 in?
Area code 925 is in California.
What counties are covered by area code 925?
Area code 925 covers communities in Contra Costa County and Alameda County.
Is 925 a toll-free area code?
No. 925 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 925, answered by an AI agent
A local number for Concord, Antioch, and Livermore, 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.