Local Calling Guide
Area code/prefix search
NPA: 443
[Rate centres in NPA 443]
[Dial plan for NPA 443]
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| NPA-NXX |
BLOCK |
Rate Centre |
Region |
Switch |
OCN |
LATA |
LIR |
Eff date |
Disc date |
| 443-639
| 6 |
Hampstead |
MD |
|
8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) |
238 |
|
2015-06-13 |
|
| 443-639
| 7 |
Hampstead |
MD |
|
508J CENTURYLINK COMMUNICATIONS, LLC |
238 |
|
2014-06-12 |
|
| 443-639
| 8 |
Hampstead |
MD |
|
876D ONVOY, LLC - MD |
238 |
|
2014-10-21 |
|
| 443-639
| 9 |
Hampstead |
MD |
|
876D ONVOY, LLC - MD |
238 |
|
2014-10-21 |
|
| 443-640
| A |
Bel Air |
MD |
|
829J PAETEC ITEL, LLC |
238 |
|
2025-04-01 |
|
| 443-640
| 0 |
Bel Air |
MD |
|
829J PAETEC ITEL, LLC |
238 |
|
|
|
| 443-640
| 1 |
Bel Air |
MD |
|
829J PAETEC ITEL, LLC |
238 |
|
|
|
| 443-640
| 2 |
Bel Air |
MD |
|
829J PAETEC ITEL, LLC |
238 |
|
|
|
| 443-640
| 3 |
Bel Air |
MD |
|
829J PAETEC ITEL, LLC |
238 |
|
|
|
| 443-640
| 4 |
Bel Air |
MD |
|
318J COMCAST IP PHONE, LLC |
238 |
|
2008-04-30 |
|
| 443-640
| 5 |
Bel Air |
MD |
|
6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD |
238 |
|
2009-02-02 |
|
| 443-640
| 6 |
Bel Air |
MD |
|
420C ARMSTRONG TELECOMMUNICATIONS, INC. - MD |
238 |
|
2008-09-08 |
|
| 443-640
| 7 |
Bel Air |
MD |
|
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
238 |
|
2012-03-16 |
|
| 443-640
| 8 |
Bel Air |
MD |
|
6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC |
238 |
|
2008-04-21 |
|
| 443-640
| 9 |
Bel Air |
MD |
|
073H TELNYX LLC |
238 |
|
2021-03-04 |
|
| 443-641
| A |
Pikesville |
MD |
BLTMMDSN6MD |
6119 LEVEL 3 COMMUNICATIONS, LLC - MD |
238 |
|
|
|
| 443-641
| 0 |
Pikesville |
MD |
|
568G PEERLESS NETWORK OF MARYLAND, LLC |
238 |
|
2013-05-04 |
|
| 443-641
| 1 |
Pikesville |
MD |
|
6119 LEVEL 3 COMMUNICATIONS, LLC - MD |
238 |
|
|
|
| 443-641
| 2 |
Pikesville |
MD |
|
9212 VERIZON MARYLAND, INC. |
238 |
|
2004-10-10 |
|
| 443-641
| 3 |
Pikesville |
MD |
|
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
238 |
|
2011-08-05 |
|
| 443-641
| 4 |
Pikesville |
MD |
|
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
238 |
|
2011-08-05 |
|
| 443-641
| 5 |
Pikesville |
MD |
|
9212 VERIZON MARYLAND, INC. |
238 |
|
2004-10-10 |
|
| 443-641
| 6 |
Pikesville |
MD |
|
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
238 |
|
2011-11-28 |
|
| 443-641
| 7 |
Pikesville |
MD |
|
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
238 |
|
2011-11-28 |
|
| 443-641
| 8 |
Pikesville |
MD |
|
568G PEERLESS NETWORK OF MARYLAND, LLC |
238 |
|
2013-05-04 |
|
| 443-641
| 9 |
Pikesville |
MD |
|
6119 LEVEL 3 COMMUNICATIONS, LLC - MD |
238 |
|
|
|
| 443-642
| A |
Baltimore |
MD |
BLTOMDKHBMD |
6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD |
238 |
|
|
|
| 443-642
| 0 |
Baltimore |
MD |
|
6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD |
238 |
|
2007-01-06 |
|
| 443-642
| 1 |
Baltimore |
MD |
|
6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC |
238 |
|
2007-03-11 |
|
| 443-642
| 2 |
Baltimore |
MD |
|
9212 VERIZON MARYLAND, INC. |
238 |
|
2007-01-08 |
|
| 443-642
| 3 |
Baltimore |
MD |
|
9212 VERIZON MARYLAND, INC. |
238 |
|
2007-01-08 |
|
| 443-642
| 4 |
Baltimore |
MD |
|
9212 VERIZON MARYLAND, INC. |
238 |
|
2007-01-08 |
|
| 443-642
| 5 |
Baltimore |
MD |
|
9212 VERIZON MARYLAND, INC. |
238 |
|
2007-01-08 |
|
| 443-642
| 6 |
Baltimore |
MD |
|
9212 VERIZON MARYLAND, INC. |
238 |
|
2007-01-08 |
|
| 443-642
| 7 |
Baltimore |
MD |
|
6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC |
238 |
|
2007-03-24 |
|
| 443-642
| 8 |
Baltimore |
MD |
|
6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC |
238 |
|
2007-03-24 |
|
| 443-642
| 9 |
Baltimore |
MD |
|
6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC |
238 |
|
2007-03-24 |
|
| 443-643
| A |
Bel Air |
MD |
BLARMDBLDS0 |
9212 VERIZON MARYLAND, INC. |
238 |
|
|
|
| 443-643
| 0 |
Bel Air |
MD |
|
568G PEERLESS NETWORK OF MARYLAND, LLC |
238 |
|
2013-05-04 |
|
| 443-643
| 1 |
Bel Air |
MD |
|
9212 VERIZON MARYLAND, INC. |
238 |
|
|
|
| 443-643
| 2 |
Bel Air |
MD |
|
9212 VERIZON MARYLAND, INC. |
238 |
|
|
|
| 443-643
| 3 |
Bel Air |
MD |
|
9212 VERIZON MARYLAND, INC. |
238 |
|
|
|
| 443-643
| 4 |
Bel Air |
MD |
|
9212 VERIZON MARYLAND, INC. |
238 |
|
|
|
| 443-643
| 5 |
Bel Air |
MD |
|
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
238 |
|
2006-04-08 |
|
| 443-643
| 6 |
Bel Air |
MD |
|
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
238 |
|
2006-04-08 |
|
| 443-643
| 7 |
Bel Air |
MD |
|
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
238 |
|
2006-04-08 |
|
| 443-643
| 8 |
Bel Air |
MD |
|
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
238 |
|
2006-04-08 |
|
| 443-643
| 9 |
Bel Air |
MD |
|
568G PEERLESS NETWORK OF MARYLAND, LLC |
238 |
|
2013-05-04 |
|
| 443-644
| A |
Jarrettsville |
MD |
|
829J PAETEC ITEL, LLC |
238 |
|
2025-04-01 |
|
| 443-644
| 1 |
Jarrettsville |
MD |
|
829J PAETEC ITEL, LLC |
238 |
|
|
|
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Last updated: Thu, 29 Jan 2026 14:35:03 UTC
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