Area codes · +1
Area code 240
Area code 240 is centred on suburban Maryland outside Washington, DC. We hold 7,896 allocated blocks for it across 63 rate centres, split 46% mobile, 40% landline and 15% VoIP.
The other area codes laid over 240
Area code 240 does not have suburban Maryland outside Washington, DC to itself. 2 other codes — 227, 301 — serve 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.
Each holds its own blocks and its own carrier mix, so a 240 number and a 227 number from the same street can report different line types. Filtering suburban Maryland outside Washington, DC by area code needs all 3 of them.
240 is not confined to suburban Maryland outside Washington, DC itself: its blocks sit across 63 rate centres, named in the table below.
Maryland is split across 6 area codes — 240, 443, 301, 410, 667, 227. By allocated blocks 240 is the largest of them, holding 26% of the Maryland total.
Where 240 numbers are concentrated
NANPA truncates rate-centre names to ten characters and drops the spaces, which is why Laurel236 and Ashton236 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 240 |
|---|---|---|
| Washington | 673 | 9% |
| Washington | 634 | 8% |
| Washington | 494 | 6% |
| Frederick | 443 | 6% |
| Laurel236 | 419 | 5% |
| Gaithersbg | 400 | 5% |
| Hagerstown | 353 | 4% |
| Washington | 320 | 4% |
| Washington | 298 | 4% |
| Waldorf | 276 | 3% |
| Ashton236 | 275 | 3% |
| Wsng236Z13 | 188 | 2% |
| Washington | 177 | 2% |
| Laurel238 | 170 | 2% |
| Leonardtn | 167 | 2% |
| Cumberland | 166 | 2% |
| Wsng236Z14 | 152 | 2% |
| Washington | 133 | 2% |
| Washington | 120 | 2% |
| Lxtnpkgrml | 116 | 1% |
| Myersville | 111 | 1% |
| Washington | 110 | 1% |
| Hughesvl | 91 | 1% |
| Wsng236Z15 | 87 | 1% |
39 further rate centres in 240 hold fewer blocks than these.
Carriers holding the most 240 blocks
Onvoy957 blocks
Omnipoint Communications Cap Operations, Llc821 blocks
Verizon Wireless757 blocks
AT&T Wireless720 blocks
T-Mobile USA, Inc.697 blocks
Bandwidth555 blocks
The largest holder, Onvoy, has 12% of the code.
These are original allocations. A number keeps its digits and its block when its subscriber moves network, so a ported 240 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 240 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 240?
Area code 240 covers suburban Maryland outside Washington, DC. It is not the only code there: 227, 301 are overlays on the same rate centres, so a suburban Maryland outside Washington, DC number can start with any of them.
Is a 240 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 240 the split runs 46% mobile, 40% landline and 15% VoIP, so mobile is the most likely single answer.
Which carriers hold 240 numbers?
The largest holders are Onvoy, Omnipoint Communications Cap Operations, Llc, Verizon Wireless. That is the carrier the block was allocated to, which is not necessarily the network a given number sits on today.
How many 240 numbers are there?
The code holds 7,896 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 240 covers on the order of 7,896,000 possible numbers — most of which have never been issued to anyone.