Area codes · +1
Area code 840
Area code 840 covers Pomona, California. We hold 1,319 allocated blocks for it across 19 rate centres, split 61% mobile, 1% landline and 38% VoIP.
The other area codes laid over 840
Area code 840 does not have Pomona to itself. 1 other code — 909 — 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.
9096,368 blocks, 25 rate centres, mostly mobile
Each holds its own blocks and its own carrier mix, so a 840 number and a 909 number from the same street can report different line types. Filtering Pomona by area code needs all 2 of them.
840 is not confined to Pomona itself: its blocks sit across 19 rate centres, named in the table below.
California is split across 40 area codes — 657, 707, 559, 209, 530, 840 and others. By allocated blocks 840 is the 34th largest of them, holding 1% of the California total.
Where 840 numbers are concentrated
NANPA truncates rate-centre names to ten characters and drops the spaces, which is why S Berndino and Bigbear Cy 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 840 |
|---|---|---|
| Pomona | 175 | 13% |
| S Berndino | 154 | 12% |
| Arrowhead | 143 | 11% |
| Fontana | 129 | 10% |
| Chino | 86 | 7% |
| Claremont | 84 | 6% |
| Ontario | 74 | 6% |
| Upland | 72 | 5% |
| Colton | 62 | 5% |
| Redlands | 55 | 4% |
| Highland | 53 | 4% |
| Rialto | 52 | 4% |
| Marshall | 50 | 4% |
| Diamondbar | 38 | 3% |
| Calimesa | 32 | 2% |
| Etiwanda | 25 | 2% |
| Mentone | 16 | 1% |
| Bigbear Cy | 11 | 1% |
| Crestline | 8 | 1% |
Carriers holding the most 840 blocks
AT&T Wireless280 blocks
T-Mobile Usa, Inc.277 blocks
Onvoy276 blocks
Verizon Wireless193 blocks
Commio, Llc65 blocks
Fractel, Llc59 blocks
The largest holder, AT&T Wireless, has 21% of the code.
These are original allocations. A number keeps its digits and its block when its subscriber moves network, so a ported 840 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 840 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 840?
Area code 840 covers Pomona, California. It is not the only code there: 909 is an overlay on the same rate centres, so a Pomona, California number can start with any of them.
Is a 840 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 840 the split runs 61% mobile, 1% landline and 38% VoIP, so mobile is the most likely single answer.
Which carriers hold 840 numbers?
The largest holders are AT&T Wireless, T-Mobile Usa, Inc., Onvoy. That is the carrier the block was allocated to, which is not necessarily the network a given number sits on today.
How many 840 numbers are there?
The code holds 1,319 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 840 covers on the order of 1,319,000 possible numbers — most of which have never been issued to anyone.