Area codes · +1
Area code 667
Area code 667 is centred on Baltimore, Maryland. We hold 4,413 allocated blocks for it across 102 rate centres, split 43% mobile, 35% landline and 21% VoIP.
The other area codes laid over 667
Area code 667 does not have Baltimore to itself. 2 other codes — 410, 443 — 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 667 number and a 410 number from the same street can report different line types. Filtering Baltimore by area code needs all 3 of them.
667 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 667 is the 5th largest of them, holding 14% of the Maryland total.
Where 667 numbers are concentrated
NANPA truncates rate-centre names to ten characters and drops the spaces, which is why Catonsvl and Centrevl 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 667 |
|---|---|---|
| Baltimore | 831 | 19% |
| Pikesville | 261 | 6% |
| Aberdeen | 242 | 5% |
| Annapolis | 184 | 4% |
| Salisbury | 161 | 4% |
| Columbia | 138 | 3% |
| Catonsvl | 122 | 3% |
| Towson | 114 | 3% |
| Glenburnie | 82 | 2% |
| Odenton | 80 | 2% |
| Bel Air | 79 | 2% |
| Elkton | 72 | 2% |
| Parkville | 62 | 1% |
| Princefrck | 61 | 1% |
| Essex | 60 | 1% |
| Westminstr | 53 | 1% |
| Cambridge | 52 | 1% |
| Severn | 52 | 1% |
| Argrgbsnis | 44 | 1% |
| Centrevl | 43 | 1% |
| Elkridge | 43 | 1% |
| Edgewood | 41 | 1% |
| Severna Pk | 40 | 1% |
| Ellicottcy | 39 | 1% |
78 further rate centres in 667 hold fewer blocks than these.
Carriers holding the most 667 blocks
Onvoy933 blocks
AT&T Wireless715 blocks
Omnipoint Communications Cap Operations, Llc334 blocks
Core Communications, Inc.293 blocks
T-Mobile USA, Inc.292 blocks
Onvoy Spectrum280 blocks
The largest holder, Onvoy, 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 667 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 667 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 667?
Area code 667 covers Baltimore, Maryland. It is not the only code there: 410, 443 are overlays on the same rate centres, so a Baltimore, Maryland number can start with any of them.
Is a 667 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 667 the split runs 43% mobile, 35% landline and 21% VoIP, so mobile is the most likely single answer.
Which carriers hold 667 numbers?
The largest holders are Onvoy, AT&T Wireless, Omnipoint Communications Cap Operations, Llc. That is the carrier the block was allocated to, which is not necessarily the network a given number sits on today.
How many 667 numbers are there?
The code holds 4,413 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 667 covers on the order of 4,413,000 possible numbers — most of which have never been issued to anyone.