Area code 925 covers Concord and surrounding areas in California. It was activated in 1998 as an overlay of area code 510. For the full picture, see all California area codes.
| State | California |
|---|---|
| Primary city | Concord |
| Cities also served | Concord, Walnut Creek, Antioch, Livermore, Pleasanton, San Ramon, Danville, Martinez |
| Time zone | Pacific (UTC-8 / UTC-7 DST) |
| Year established | March 14, 1998 |
| Original 1947 NPA? | No |
| Parent code | 510 |
| Overlay codes | None |
| Currently in use? | Yes, actively assigned |
| Ten-digit dialing required? | Yes |
Cities Served by Area Code 925
Area code 925 serves Inland East Bay — Contra Costa County and eastern Alameda County, San Francisco Bay Area, including the following cities and communities:
- Concord
- Walnut Creek
- Antioch
- Livermore
- Pleasanton
- San Ramon
- Danville
- Martinez
Nearby area codes covering the same broader region include: 510, 341, 415, 650.
How to Get a 925 Phone Number
There are three ways to get a phone number with the 925 area code, each suited to a different need:
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Browse 925 Numbers →- Buy from a premium-number specialist. Companies that hold curated inventories of specific area codes can sell you a 925 number directly, often with a one-time fee and ownership transferred to you (no recurring carrier fees). This is the option for picking a specific memorable number, or for getting an area code that most carriers won’t let you request. Browse our 925 inventory.
- Sign up with a VoIP carrier. Voice-over-IP services (such as Google Voice, OpenPhone, Grasshopper, and many others) can typically provision a 925 number on request, especially for active overlay codes. You won’t usually get to pick the specific number, but you’ll get a working line in the area code. This is the cheapest option for anyone who doesn’t need a particular number.
- Port an existing 925 number. If you already have a 925 phone number with another carrier, you can transfer it (port it) to a new service provider while keeping the number. This works for landlines, cell phones, and VoIP services, though landlines outside of California sometimes can’t accept inbound ports of 925 numbers due to 911 routing rules.
Looking for a 925 number? 212areacode.com offers premium 925 numbers for Concord, California — choose your number, port it to any carrier in 3–5 business days, and pay a one-time fee with no monthly charges. Browse available 925 numbers →
Frequently Asked Questions
Is the 925 area code still in use?
Yes. 925 is actively assigned to new phone lines in Inland East Bay — Contra Costa County and eastern Alameda County, San Francisco Bay Area.
What is the parent area code of 925?
Area code 925 is an overlay of 510. Both codes serve the same region of California.
Can I get a 925 number if I don't live in California?
Yes. Phone numbers are no longer tied to a physical address. With VoIP service or a number broker, you can hold a 925 number from anywhere in the world. The number routes to whatever device or carrier you specify.
Is 925 a scam area code?
No. 925 is a legitimate, active area code for Inland East Bay — Contra Costa County and eastern Alameda County, San Francisco Bay Area. Like any area code, scammers occasionally spoof 925 caller IDs, but the code itself is heavily used by real California businesses, government offices, and residents.
What cities are covered by the 925 area code?
The 925 area code covers the inland East Bay, including Concord, Walnut Creek, Antioch, Livermore, Pleasanton, San Ramon, Danville, and Martinez, spanning most of Contra Costa County and eastern Alameda County.
When was the 925 area code created?
Area code 925 went into service on March 14, 1998, when area code 510 was split along the natural boundary of the Berkeley Hills, separating the coastal and inland portions of the East Bay.
Does the 925 area code have any overlays?
As of 2026, area code 925 has no active overlay. It is the sole area code for its territory. Ten-digit dialing is still required, however, because it was mandated on October 24, 2021 to prevent conflicts with the 988 Suicide & Crisis Lifeline.
What time zone is the 925 area code in?
The 925 area code operates in the Pacific Time Zone — UTC-8 standard time and UTC-7 during daylight saving time.
Related Reading
- Why Use Area Codes For Local Calls?
- What States Have the Most Area Codes?
- Most Desirable Area Codes
- How Do Area Codes Work?
Looking for a different code? See the complete US area code directory.
