Area codes · +1
Area code 410
Area code 410 is centred on Baltimore, Maryland. We hold 4,537 allocated blocks for it across 102 rate centres, split 23% mobile, 70% landline and 7% VoIP.
The other area codes laid over 410
Area code 410 does not have Baltimore to itself. 2 other codes — 443, 667 — 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 410 number and a 443 number from the same street can report different line types. Filtering Baltimore by area code needs all 3 of them.
410 is not confined to Baltimore itself: its blocks sit across 102 rate centres, named in the table below.
Maryland is split across 6 area codes — 240, 443, 301, 410, 667, 227. By allocated blocks 410 is the 4th largest of them, holding 15% of the Maryland total.
Where 410 numbers are concentrated
NANPA truncates rate-centre names to ten characters and drops the spaces, which is why Severna Pk and Catonsvl 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 410 |
|---|---|---|
| Baltimore | 909 | 20% |
| Towson | 252 | 6% |
| Glenburnie | 219 | 5% |
| Annapolis | 196 | 4% |
| Severna Pk | 168 | 4% |
| Catonsvl | 135 | 3% |
| Fork | 130 | 3% |
| Cockeysvl | 116 | 3% |
| Pikesville | 109 | 2% |
| Easton | 103 | 2% |
| Elkridge | 100 | 2% |
| Ellicottcy | 96 | 2% |
| Salisbury | 94 | 2% |
| Waterlo236 | 93 | 2% |
| Arbutus | 79 | 2% |
| Edgewood | 68 | 1% |
| Parkville | 63 | 1% |
| Bel Air | 60 | 1% |
| Columbia | 60 | 1% |
| Odenton | 56 | 1% |
| Essex | 50 | 1% |
| Severn | 49 | 1% |
| Elkton | 47 | 1% |
| Sykesville | 46 | 1% |
78 further rate centres in 410 hold fewer blocks than these.
Carriers holding the most 410 blocks
Verizon Maryland, Inc.1,356 blocks
Verizon Maryland, Inc. (Verizon Communications)513 blocks
AT&T Wireless305 blocks
Onvoy242 blocks
Omnipoint Communications Cap Operations, Llc204 blocks
T-Mobile USA, Inc.193 blocks
The largest holder, Verizon Maryland, Inc., has 30% of the code.
These are original allocations. A number keeps its digits and its block when its subscriber moves network, so a ported 410 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 410 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 410?
Area code 410 covers Baltimore, Maryland. It is not the only code there: 443, 667 are overlays on the same rate centres, so a Baltimore, Maryland number can start with any of them.
Is a 410 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 410 the split runs 23% mobile, 70% landline and 7% VoIP, so landline is the most likely single answer.
Which carriers hold 410 numbers?
The largest holders are Verizon Maryland, Inc., Verizon Maryland, Inc. (Verizon Communications), 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 410 numbers are there?
The code holds 4,537 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 410 covers on the order of 4,537,000 possible numbers — most of which have never been issued to anyone.