Cities in area code 925
Area code 925 serves 17 localities in California, led by Walnut Creek, Concord, Pleasanton. The table lists every rate center — the billing locality each prefix is anchored to — with its share of the code's 631 active prefixes.
Walnut Creek, Concord, Pleasanton, Antioch, Livermore, Bishop Ranch, Dublin-san Ramon and Danville hold the largest prefix inventories; and 8 smaller communities down to single-prefix localities. Each locality below links to its rate-center page with the full prefix list.
Metropolitan coverage: 17 rate centers belong to FCC top-100 metro areas.
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 |
|---|---|---|---|
| Walnut Creek | 102 | San Francisco-Oakland-Fremont, CA | 925 |
| Concord | 88 | San Francisco-Oakland-Fremont, CA | 925 |
| Pleasanton | 76 | San Francisco-Oakland-Fremont, CA | 925 |
| Antioch | 65 | San Francisco-Oakland-Fremont, CA | 925 |
| Livermore | 49 | San Francisco-Oakland-Fremont, CA | 925 |
| Bishop Ranch | 43 | San Francisco-Oakland-Fremont, CA | 925 |
| Dublin-san Ramon | 41 | San Francisco-Oakland-Fremont, CA | 925 |
| Danville | 38 | San Francisco-Oakland-Fremont, CA | 925 |
| Martinez | 21 | San Francisco-Oakland-Fremont, CA | 925 |
| East Contra Costa | 21 | San Francisco-Oakland-Fremont, CA | 925 |
| Pittsburg | 19 | San Francisco-Oakland-Fremont, CA | 925 |
| Lafayette | 15 | San Francisco-Oakland-Fremont, CA | 925 |
| Orinda | 12 | San Francisco-Oakland-Fremont, CA | 925 |
| Clayton | 12 | San Francisco-Oakland-Fremont, CA | 925 |
| Moraga | 11 | San Francisco-Oakland-Fremont, CA | 925 |
| Pittsburg West | 9 | San Francisco-Oakland-Fremont, CA | 925 |
| Sunol | 9 | San Francisco-Oakland-Fremont, CA | 925 |
FAQ
What is the biggest city in area code 925?
Walnut Creek holds the most active prefixes (102), making it the code's largest numbering locality.
How many places does 925 cover?
17 rate centers in California hold active 925 prefixes, from Walnut Creek down to communities with a single prefix.
Does a 925 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.