Area codes · +1
Area code 301
Area code 301 is centred on suburban Maryland outside Washington, DC. We hold 4,750 allocated blocks for it across 64 rate centres, split 27% mobile, 66% landline and 7% VoIP.
The other area codes laid over 301
Area code 301 does not have suburban Maryland outside Washington, DC to itself. 2 other codes — 227, 240 — 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 301 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.
301 is not confined to suburban Maryland outside Washington, DC itself: its blocks sit across 64 rate centres, named in the table below.
Maryland is split across 6 area codes — 240, 443, 301, 410, 667, 227. By allocated blocks 301 is the third largest of them, holding 16% of the Maryland total.
Where 301 numbers are concentrated
NANPA truncates rate-centre names to ten characters and drops the spaces, which is why Wsng236Z13 and Wsng236Z14 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 301 |
|---|---|---|
| Washington | 502 | 11% |
| Washington | 418 | 9% |
| Washington | 332 | 7% |
| Wsng236Z13 | 313 | 7% |
| Washington | 237 | 5% |
| Frederick | 227 | 5% |
| Gaithersbg | 193 | 4% |
| Washington | 167 | 4% |
| Waldorf | 165 | 3% |
| Hagerstown | 161 | 3% |
| Wsng236Z14 | 151 | 3% |
| Washington | 140 | 3% |
| Laurel236 | 133 | 3% |
| Washington | 133 | 3% |
| Cumberland | 94 | 2% |
| Washington | 80 | 2% |
| Wsng238Z14 | 79 | 2% |
| Washington | 75 | 2% |
| Ashton236 | 69 | 1% |
| Oakland | 68 | 1% |
| Indianhead | 66 | 1% |
| Lxtnpkgrml | 61 | 1% |
| Leonardtn | 59 | 1% |
| Myersville | 59 | 1% |
40 further rate centres in 301 hold fewer blocks than these.
Carriers holding the most 301 blocks
Verizon Maryland, Inc.1,144 blocks
Verizon Maryland, Inc. (Verizon Communications)479 blocks
T-Mobile USA, Inc.308 blocks
Verizon Wireless262 blocks
Onvoy256 blocks
Bandwidth252 blocks
The largest holder, Verizon Maryland, Inc., has 24% of the code.
These are original allocations. A number keeps its digits and its block when its subscriber moves network, so a ported 301 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 301 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 301?
Area code 301 covers suburban Maryland outside Washington, DC. It is not the only code there: 227, 240 are overlays on the same rate centres, so a suburban Maryland outside Washington, DC number can start with any of them.
Is a 301 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 301 the split runs 27% mobile, 66% landline and 7% VoIP, so landline is the most likely single answer.
Which carriers hold 301 numbers?
The largest holders are Verizon Maryland, Inc., Verizon Maryland, Inc. (Verizon Communications), 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 301 numbers are there?
The code holds 4,750 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 301 covers on the order of 4,750,000 possible numbers — most of which have never been issued to anyone.