Area codes · +1
Area code 925
Area code 925 covers Concord, California. We hold 5,020 allocated blocks for it across 17 rate centres, split 36% mobile, 51% landline and 13% VoIP.
How far area code 925 reaches
Area code 925 covers 17 rate centres, so two 925 numbers are not always a local call to each other.
A rate centre is a billing boundary rather than a postal one, which is why an area code can span several and a single city can contain many. It is also why the code alone cannot place a subscriber beyond a rough region.
California is split across 40 area codes — 657, 707, 559, 209, 530, 925 and others. By allocated blocks 925 is the 22th largest of them, holding 3% of the California total.
Where 925 numbers are concentrated
NANPA truncates rate-centre names to ten characters and drops the spaces, which is why Walnut Crk and Bshp Rnch are shortened. Names are reproduced as recorded rather than expanded — the abbreviation is the key the block data is filed under.
| Rate centre | Blocks | Share of 925 |
|---|---|---|
| Concord | 696 | 14% |
| Walnut Crk | 642 | 13% |
| Pleasanton | 575 | 11% |
| Antioch | 541 | 11% |
| Livermore | 391 | 8% |
| Dubln-Snrm | 332 | 7% |
| Danville | 317 | 6% |
| Bshp Rnch | 309 | 6% |
| Econtrcost | 211 | 4% |
| Martinez | 187 | 4% |
| Pittsburg | 143 | 3% |
| Lafayette | 123 | 2% |
| Clayton | 120 | 2% |
| Orinda | 108 | 2% |
| Moraga | 103 | 2% |
| Psbg West | 99 | 2% |
| Sunol | 91 | 2% |
Carriers holding the most 925 blocks
Pacific Bell757 blocks
Onvoy599 blocks
AT&T Wireless431 blocks
Verizon Wireless393 blocks
T-Mobile USA, Inc.340 blocks
T-Mobile Usa, Inc.274 blocks
The largest holder, Pacific Bell, has 15% of the code.
These are original allocations. A number keeps its digits and its block when its subscriber moves network, so a ported 925 number still reports the carrier it started with. Closing that gap needs a live query against the routing database. How line type is derived.
Check a single 925 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 925?
Area code 925 covers Concord, California, spanning 17 rate centres.
Is a 925 number a mobile or a landline?
It can be either, and the digits do not say which. North American mobile and landline numbers share the same ranges, so the answer comes from the carrier holding the block. In 925 the split runs 36% mobile, 51% landline and 13% VoIP, so landline is the most likely single answer.
Which carriers hold 925 numbers?
The largest holders are Pacific Bell, Onvoy, AT&T Wireless. That is the carrier the block was allocated to, which is not necessarily the network a given number sits on today.
How many 925 numbers are there?
The code holds 5,020 allocated blocks in our copy of the numbering plan. A block is 1,000 or 10,000 consecutive numbers depending on how deeply it has been pooled, so 925 covers on the order of 5,020,000 possible numbers — most of which have never been issued to anyone.