925 Area CodeConcord, CA
Area code 925 covers Concord and nearby communities in California, in the Pacific Time (PT) zone, home to about 1.2 million people across 41 cities. It overlays 510, so the same region uses both and every local call needs all ten digits.
Where is area code 925?
Area code 925 serves part of Concord, CA and the surrounding areas. It has a single overlay (510) that serves the same area.
Overview of the 925 Area Code
What is the 925 area code?
The 925 area code serves Concord, California, alongside other established area codes. When you see a 925 number, it indicates a local number within this geographic area.
Why was area code 925 created?
The 925 area code was introduced as an overlay to add numbers in Concord once the existing area code 510 began to run out of available prefixes. It added a new supply of numbers without requiring current residents to change their existing digits.
Geographic Coverage of the 925 Area Code
The 925 area code serves Concord and surrounding areas in California. It operates within the Pacific Time (PT) time zone. It complements the coverage of area code 510. This area code covers several key cities, including:
- Concord
- Antioch
- Mountain View
- San Ramon
- Livermore
- Pittsburg
Got a call from a 925 number? It came from Concord, CA. Since 925 overlays with 510, every local call in the region needs all ten digits to land on the right line. Inside 925, Concord holds about 10% of the population; the rest is split across 40 smaller cities.
Concord Area Codes Overview
Concord is served by multiple area codes, reflecting its telecommunications needs. The 925 area code operates alongside 510. Here are the area codes serving this region:
The introduction of the 925 area code helped prevent number exhaustion, ensuring a continuous supply of phone numbers across the geographic area.
What cities does area code 925 cover?
| City | State | Population | % of Area Code | % of City |
|---|---|---|---|---|
| Concord | CA | 124,016 | 3% | 100% |
| Antioch | CA | 118,453 | 3% | 100% |
| Mountain View | CA | 87,316 | 0% | 100% |
| San Ramon | CA | 85,924 | 2% | 100% |
| Livermore | CA | 84,867 | 2% | 100% |
| Pittsburg | CA | 77,131 | 2% | 100% |
| Pleasanton | CA | 75,664 | 2% | 100% |
| Walnut Creek | CA | 70,817 | 2% | 100% |
| Dublin | CA | 70,544 | 1% | 100% |
| Brentwood | CA | 66,286 | 1% | 100% |
* Sources: Population – U.S. Census Bureau PEP, Vintage 2024 (SUB-IP-EST2024-POP). Area code assignments – NANPA CO Code data. See our data methodology.
Has area code 925 been reported for unwanted calls?
Yes – 700 unwanted-call complaints were reported to the FTC for numbers showing a 925 area code (May 29 – Jul 2, 2026).
- 68% robocalls
- ↑ 5% vs prior period
Most-reported subjects
- Other47%329
- Dropped call or no message16%110
- Reducing your debt (credit cards, mortgage, student loans)10%71
* Caller ID is easily spoofed, so these figures reflect the number shown on caller ID, not the caller's true location – an area code alone never identifies a caller. The FTC does not verify the facts in these complaints. Source: FTC Do Not Call (DNC) Reported Calls Data, retrieved 2026-07-05.
Which prefixes and exchanges belong to area code 925?
62% assigned to a telco
- 77% Landline
- 23% Wireless
- 0% Unknown
| Prefix | Usage | Carrier |
|---|---|---|
| (925)200- | Wireless | Verizon Wireless |
| (925)201- | Landline | Tpx Communications |
| (925)202- | Wireless | Sprint Spectrum |
| (925)203- | Wireless | New Cingular Wireless Pcs |
| (925)204- | Wireless | T-Mobile Usa |
| (925)205- | Landline | American Messaging Services |
| (925)206- | Wireless | Verizon Wireless |
| (925)207- | Wireless | Sprint Spectrum |
| (925)208- | Landline | Teleport Communications America |
| (925)209- | Wireless | Sprint Spectrum |
Frequently Asked Questions about the 925 Area Code
Who called me from a 925 number?
A 925 number is assigned to Concord, California, so a call may come from there. But caller ID is easy to fake, and scammers often spoof a local 925 code to look nearby, so a 925 number doesn't prove the caller is local. Recently, 700 unwanted-call complaints were reported to the FTC for numbers showing the 925 code (68% flagged as robocalls). If you don't recognize the number, let it go to voicemail; a real caller will leave a message.
Is 925 a scam area code?
No area code is a scam on its own. 925 is a normal, officially assigned code for Concord, California. Spam callers spoof local codes to raise the odds you answer, so 925 on your caller ID says nothing about who is really calling. Recently, 700 unwanted-call complaints were reported to the FTC for numbers showing the 925 code (68% flagged as robocalls). Judge the call itself, not the area code.
Why do I keep getting calls from the 925 area code?
Repeated calls from different 925 numbers are usually spoofing: a robocaller rotates through 925 numbers so each call looks local and slips past simple blocks. Recently, 700 unwanted-call complaints were reported to the FTC for numbers showing the 925 code (68% flagged as robocalls). Blocking one number rarely helps; voicemail screening, your carrier spam filter, and the Do Not Call Registry work better.
Should I answer an unknown 925 number?
If you aren't expecting a 925 call, let it ring to voicemail. Legitimate callers leave a message, most robocallers hang up when no one picks up, and answering can mark your number as active and bring more calls.
How do I block calls from the 925 area code?
Block a single 925 number from your recent-calls list (iPhone: tap the number, then Block this Caller; Android: tap the number, then Block or report spam). To cut the volume, turn on Silence Unknown Callers on iPhone or spam protection on Android, enable spam filtering from your carrier, and register at DoNotCall.gov. Blocking the entire 925 code also stops legitimate local calls, so use it only as a last resort.
Where is area code 925?
Area code 925 covers Concord and the surrounding area in California, spanning 41 cities with about 1,194,349 residents. It shares its area with overlay code 510.
Is 925 a real area code?
Yes. 925 is an active code in the North American Numbering Plan, assigned by NANPA and in service for Concord, California. A real code can still show up on spoofed spam calls, so treat unknown 925 calls with normal caution.
What timezone is the 925 area code in?
The 925 area code is in the Pacific Time (PT). Because a number can be kept when someone moves or switches to VoIP, a specific 925 caller may not be in that zone.
How do I call a 925 number from abroad?
From outside the US, dial your country's exit code, then 1 (the US country code), then 925 and the seven-digit number. From a mobile phone you can usually just enter +1 925 followed by the number and let the phone add the exit code for you.