Maryland area code
Area code 443
443 is a Maryland area code covering Baltimore, Annapolis and Towson. Check a 443 number below to see if it is mobile, landline or VoIP, and which carrier it is with today.
Verdicts describe reachability. They are not compliance checks.
- State
- Maryland
- Exchanges in use
- 786
- Thousands-blocks assigned
- 6,918
- Carriers holding numbers
- 42
An exchange is the three digits after the area code, 10,000 numbers. A thousands-block is 1,000 of them, assigned to a carrier on its own.
Rate centres in 443
A rate centre is the local area a number belongs to. Names are as NANPA files them, often abbreviated. The 12 with the most exchanges, of 81.
| Rate centre (as filed) | Exchanges |
|---|---|
| BALTIMORE | 186 |
| ANNAPOLIS | 39 |
| TOWSON | 33 |
| COLUMBIA | 31 |
| GLENBURNIE | 26 |
| CATONSVL | 22 |
| PIKESVILLE | 21 |
| SALISBURY | 20 |
| BEL AIR | 19 |
| ABERDEEN | 15 |
| WESTMINSTR | 15 |
| COCKEYSVL | 14 |
Carriers 443 numbers were assigned to
The carrier NANPA lists for each exchange and thousands-block. A number can be ported to another carrier after it is assigned, so check the number itself to see its carrier today.
How a port changes the carrier on your list
| Carrier (as filed) | Exchanges | Thousands-blocks |
|---|---|---|
| PAETEC ITEL, LLC | 153 | 614 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 121 | 970 |
| OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 94 | 1,101 |
| NEW CINGULAR WIRELESS PCS, LLC - DC | 71 | 715 |
| LEVEL 3 COMMUNICATIONS, LLC - MD | 69 | 296 |
| VERIZON MARYLAND, INC. | 56 | 226 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - MD | 48 | 73 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 46 | 298 |
| CORE COMMUNICATIONS, INC.- MD | 34 | 279 |
| METROPCS, INC. | 25 | 331 |
Area codes that share these places
These area codes have numbers in at least half of 443's rate centres. Usually that is an overlay, added when the first area code ran short of numbers.
410667
More Maryland area codes
Questions about this area code
Where is area code 443?
443 is a Maryland area code covering Baltimore, Annapolis and Towson. NANPA's report lists 786 exchanges in use across 81 rate centres.
Is 443 a mobile or a landline area code?
Both. An area code doesn't decide the line type: mobile, landline and VoIP numbers all use 443, and numbers move between carriers. Check the number itself to see what it is today.
Which area codes overlay 443?
410 and 667 have numbers in at least half of the same places as 443, so a new number there can get any of these area codes.
Can you tell me who owns a 443 number?
No. NumberLookup shows whether a number is valid, its line type, its carrier and its region, never the person or business behind it.
Source: NANPA's public central office code and thousands-block reports, refreshed weekly. Carriers are the ones the numbers were assigned to, not necessarily today's, and never the person who uses a number.
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