Area codes · +1
Area code 831
Area code 831 is centred on Salinas, California. We hold 3,331 allocated blocks for it across 24 rate centres, split 34% mobile, 48% landline and 18% VoIP.
The towns inside area code 831
Area code 831 is not a city code. It covers 24 separate rate centres — billing areas, each its own local calling zone. The largest of them are named in the table below.
That matters twice over. A call between two 831 numbers is not necessarily a local call, because they can sit in different rate centres. And a code this wide narrows a subscriber to a region rather than a town.
California is split across 40 area codes — 657, 707, 559, 209, 530, 831 and others. By allocated blocks 831 is the 29th largest of them, holding 2% of the California total.
Where 831 numbers are concentrated
NANPA truncates rate-centre names to ten characters and drops the spaces, which is why Watsonvl and Castrovl 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 831 |
|---|---|---|
| Salinas | 656 | 20% |
| Santa Cruz | 587 | 18% |
| Monterey | 485 | 15% |
| Watsonvl | 245 | 7% |
| Hollister | 196 | 6% |
| Aptos | 152 | 5% |
| Ben Lomond | 87 | 3% |
| Carmel | 87 | 3% |
| Felton | 78 | 2% |
| Bouldercrk | 77 | 2% |
| Soledad | 76 | 2% |
| Gonzales | 69 | 2% |
| Greenfield | 68 | 2% |
| King City | 60 | 2% |
| Castrovl | 56 | 2% |
| Carmel Vly | 51 | 2% |
| Tres Pinos | 46 | 1% |
| Big Sur | 41 | 1% |
| San Juan | 41 | 1% |
| Chualar | 38 | 1% |
| San Ardo | 34 | 1% |
| San Lucas | 33 | 1% |
| Idria | 1 | 0% |
| Pinnacles | 1 | 0% |
Carriers holding the most 831 blocks
Pacific Bell549 blocks
Onvoy528 blocks
AT&T Wireless311 blocks
Verizon Wireless262 blocks
T-Mobile USA, Inc.249 blocks
Bandwidth205 blocks
The largest holder, Pacific Bell, has 16% of the code.
These are original allocations. A number keeps its digits and its block when its subscriber moves network, so a ported 831 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 831 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 831?
Area code 831 is centred on Salinas, California and spans 24 rate centres, so it covers a region rather than a town.
Is a 831 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 831 the split runs 34% mobile, 48% landline and 18% VoIP, so landline is the most likely single answer.
Which carriers hold 831 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 831 numbers are there?
The code holds 3,331 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 831 covers on the order of 3,331,000 possible numbers — most of which have never been issued to anyone.