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 |
| 443-584
| A |
Crofton |
MD |
|
829J PAETEC ITEL, LLC |
238 |
|
2025-04-01 |
|
| 443-584
| 0 |
Crofton |
MD |
|
624H ONVOY SPECTRUM, LLC |
238 |
|
2021-05-22 |
|
| 443-584
| 1 |
Crofton |
MD |
|
829J PAETEC ITEL, LLC |
238 |
|
|
|
| 443-584
| 2 |
Crofton |
MD |
|
145J TERRA NOVA TELECOM INC. |
238 |
|
2024-02-15 |
|
| 443-584
| 3 |
Crofton |
MD |
|
071F BANDWIDTH.COM CLEC, LLC - MD |
238 |
|
2014-06-06 |
|
| 443-584
| 4 |
Crofton |
MD |
|
318J COMCAST IP PHONE, LLC |
238 |
|
2014-07-20 |
|
| 443-584
| 5 |
Crofton |
MD |
|
071F BANDWIDTH.COM CLEC, LLC - MD |
238 |
|
2015-05-21 |
|
| 443-584
| 6 |
Crofton |
MD |
|
071F BANDWIDTH.COM CLEC, LLC - MD |
238 |
|
2015-05-21 |
|
| 443-584
| 7 |
Crofton |
MD |
|
508J CENTURYLINK COMMUNICATIONS, LLC |
238 |
|
2014-06-25 |
|
| 443-584
| 8 |
Crofton |
MD |
|
515J IP HORIZON LLC |
238 |
|
2016-10-14 |
|
| 443-584
| 9 |
Crofton |
MD |
|
515J IP HORIZON LLC |
238 |
|
2015-03-21 |
|
| 443-585
| A |
Darlington |
MD |
|
829J PAETEC ITEL, LLC |
238 |
|
2025-04-01 |
|
| 443-585
| 0 |
Darlington |
MD |
|
071F BANDWIDTH.COM CLEC, LLC - MD |
238 |
|
2015-05-21 |
|
| 443-585
| 1 |
Darlington |
MD |
|
829J PAETEC ITEL, LLC |
238 |
|
|
|
| 443-585
| 2 |
Darlington |
MD |
|
071F BANDWIDTH.COM CLEC, LLC - MD |
238 |
|
2015-05-21 |
|
| 443-585
| 3 |
Darlington |
MD |
|
876D ONVOY, LLC - MD |
238 |
|
2016-04-10 |
|
| 443-585
| 4 |
Darlington |
MD |
|
876D ONVOY, LLC - MD |
238 |
|
2016-04-10 |
|
| 443-585
| 5 |
Darlington |
MD |
|
8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) |
238 |
|
2015-06-11 |
|
| 443-585
| 6 |
Darlington |
MD |
|
073H TELNYX LLC |
238 |
|
2017-04-26 |
|
| 443-585
| 7 |
Darlington |
MD |
|
508J CENTURYLINK COMMUNICATIONS, LLC |
238 |
|
2014-06-12 |
|
| 443-585
| 8 |
Darlington |
MD |
|
876D ONVOY, LLC - MD |
238 |
|
2014-09-19 |
|
| 443-585
| 9 |
Darlington |
MD |
|
876D ONVOY, LLC - MD |
238 |
|
2014-09-19 |
|
| 443-586
| A |
Dundalk |
MD |
BLTMMD91GT0 |
2593 CORE COMMUNICATIONS, INC.- MD |
238 |
|
|
|
| 443-586
| 0 |
Dundalk |
MD |
|
876D ONVOY, LLC - MD |
238 |
|
2024-02-29 |
|
| 443-586
| 1 |
Dundalk |
MD |
|
876D ONVOY, LLC - MD |
238 |
|
2024-02-29 |
|
| 443-586
| 2 |
Dundalk |
MD |
|
2593 CORE COMMUNICATIONS, INC.- MD |
238 |
|
2018-10-22 |
|
| 443-586
| 3 |
Dundalk |
MD |
|
2593 CORE COMMUNICATIONS, INC.- MD |
238 |
|
2018-10-22 |
|
| 443-586
| 4 |
Dundalk |
MD |
|
2593 CORE COMMUNICATIONS, INC.- MD |
238 |
|
2018-10-22 |
|
| 443-586
| 5 |
Dundalk |
MD |
|
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
238 |
|
2017-11-24 |
|
| 443-586
| 6 |
Dundalk |
MD |
|
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
238 |
|
2017-11-24 |
|
| 443-586
| 7 |
Dundalk |
MD |
|
876D ONVOY, LLC - MD |
238 |
|
2024-02-29 |
|
| 443-586
| 8 |
Dundalk |
MD |
|
876D ONVOY, LLC - MD |
238 |
|
2024-07-27 |
|
| 443-586
| 9 |
Dundalk |
MD |
|
876D ONVOY, LLC - MD |
238 |
|
2024-09-15 |
|
| 443-587
| A |
Edgewood |
MD |
|
829J PAETEC ITEL, LLC |
238 |
|
2025-04-01 |
|
| 443-587
| 0 |
Edgewood |
MD |
|
2593 CORE COMMUNICATIONS, INC.- MD |
238 |
|
2019-04-30 |
|
| 443-587
| 1 |
Edgewood |
MD |
|
829J PAETEC ITEL, LLC |
238 |
|
|
|
| 443-587
| 2 |
Edgewood |
MD |
|
2593 CORE COMMUNICATIONS, INC.- MD |
238 |
|
2019-04-30 |
|
| 443-587
| 3 |
Edgewood |
MD |
|
145J TERRA NOVA TELECOM INC. |
238 |
|
2026-01-04 |
|
| 443-587
| 4 |
Edgewood |
MD |
|
318J COMCAST IP PHONE, LLC |
238 |
|
2016-06-17 |
|
| 443-587
| 5 |
Edgewood |
MD |
|
145J TERRA NOVA TELECOM INC. |
238 |
|
2024-02-15 |
|
| 443-587
| 7 |
Edgewood |
MD |
|
318J COMCAST IP PHONE, LLC |
238 |
|
2016-06-21 |
|
| 443-587
| 8 |
Edgewood |
MD |
|
6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC |
238 |
|
2019-03-31 |
|
| 443-587
| 9 |
Edgewood |
MD |
|
2593 CORE COMMUNICATIONS, INC.- MD |
238 |
|
2019-04-30 |
|
| 443-588
| A |
Parkville |
MD |
BLTMMDCHXNX |
7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
238 |
|
|
|
| 443-588
| 0 |
Parkville |
MD |
|
7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
238 |
|
|
|
| 443-588
| 1 |
Parkville |
MD |
|
7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
238 |
|
|
|
| 443-588
| 2 |
Parkville |
MD |
|
7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
238 |
|
|
|
| 443-588
| 3 |
Parkville |
MD |
|
829J PAETEC ITEL, LLC |
238 |
|
2015-09-04 |
|
| 443-588
| 4 |
Parkville |
MD |
|
7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
238 |
|
|
|
| 443-588
| 5 |
Parkville |
MD |
|
7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
238 |
|
|
|
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Last updated: Thu, 29 Jan 2026 14:35:03 UTC
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