Area codes · +1
Area code 310
Area code 310 covers Los Angeles. We hold 4,332 allocated blocks for it across 17 rate centres, split 44% mobile, 51% landline and 5% VoIP.
The other area codes laid over 310
Area code 310 does not have Los Angeles to itself. 1 other code — 424 — serves the same rate centres, laid over the same ground rather than dividing it. That is an overlay: a new code added when the old one ran out of numbers, covering the same streets. Two neighbours can hold different area codes, so the code says roughly when a number was issued rather than where it sits.
4244,955 blocks, 16 rate centres, mostly landline
Each holds its own blocks and its own carrier mix, so a 310 number and a 424 number from the same street can report different line types. Filtering Los Angeles by area code needs all 2 of them.
310 is not confined to Los Angeles itself: its blocks sit across 17 rate centres, named in the table below.
California is split across 40 area codes — 657, 707, 559, 209, 530, 310 and others. By allocated blocks 310 is the 27th largest of them, holding 2% of the California total.
Where 310 numbers are concentrated
NANPA truncates rate-centre names to ten characters and drops the spaces, which is why Cmtn Grdn and Snmn Snmn 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 310 |
|---|---|---|
| Cmtn Grdn | 574 | 13% |
| Beverlyhls | 563 | 13% |
| Snmn Snmn | 404 | 9% |
| W Angeles | 379 | 9% |
| Inglewood | 299 | 7% |
| El Segundo | 259 | 6% |
| Snmn Mrvs | 254 | 6% |
| Redondo | 244 | 6% |
| Torrance | 243 | 6% |
| Hawthorne | 231 | 5% |
| San Pedro | 225 | 5% |
| Cmtn Cmtn | 224 | 5% |
| Culvercity | 206 | 5% |
| Malibu | 122 | 3% |
| Lomita | 64 | 1% |
| Avalon | 23 | 1% |
| Lakewood | 12 | 0% |
Carriers holding the most 310 blocks
Pacific Bell824 blocks
T-Mobile USA, Inc.494 blocks
T-Mobile Usa, Inc.351 blocks
AT&T Wireless306 blocks
Verizon Wireless303 blocks
Onvoy217 blocks
The largest holder, Pacific Bell, has 19% of the code.
These are original allocations. A number keeps its digits and its block when its subscriber moves network, so a ported 310 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 310 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 310?
Area code 310 covers Los Angeles. It is not the only code there: 424 is an overlay on the same rate centres, so a Los Angeles number can start with any of them.
Is a 310 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 310 the split runs 44% mobile, 51% landline and 5% VoIP, so landline is the most likely single answer.
Which carriers hold 310 numbers?
The largest holders are Pacific Bell, T-Mobile USA, Inc., T-Mobile Usa, Inc.. That is the carrier the block was allocated to, which is not necessarily the network a given number sits on today.
How many 310 numbers are there?
The code holds 4,332 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 310 covers on the order of 4,332,000 possible numbers — most of which have never been issued to anyone.