Verified Nov 1, 2026 · Source: NANPA CO Code Assignment Records
BALTIMORE prefixes in area code 443
NANPA records 185 assigned NXX blocks to rate center BALTIMORE in area code 443, 23.6% of the 785 blocks assigned in the code. A rate center is the billing geography a block is allocated to – NANPA truncates the name to ten characters, so read it as a NANPA label rather than a town. 17 holders hold those blocks, the largest being OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (61), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (55), NEW CINGULAR WIRELESS PCS, LLC - DC (26). The earliest assignment on record here is 2001-01-10 and the most recent 2014-12-23. 149 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots. The same rate center name also appears in area codes 220, 301, 410, 667 – overlay codes cover the same geography, so a rate center is served by all of them.
185 assigned blocks – 23.6% of 443
17 holders of record
149 of them pooled in 1,000-number lots
Prefixes assigned here
| Prefix | Holder of record | Assigned | Pooled | In service |
|---|---|---|---|---|
| 443-202 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2012-01-09 | yes | yes |
| 443-208 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2011-02-01 | yes | yes |
| 443-220 | Verizon VERIZON MARYLAND, INC. | – | yes | yes |
| 443-224 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | – | yes | yes |
| 443-226 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | – | yes | yes |
| 443-240 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | 2012-01-27 | yes | yes |
| 443-248 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2007-01-15 | yes | yes |
| 443-250 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | – | yes | yes |
| 443-253 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | – | no | yes |
| 443-255 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | – | no | yes |
| 443-257 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | – | yes | yes |
| 443-263 | Verizon VERIZON MARYLAND, INC. | – | no | yes |
| 443-268 | CORE COMMUNICATIONS, INC.- MD | – | no | yes |
| 443-271 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2002-10-21 | yes | yes |
| 443-278 | VDL, INC. DBA GLOBAL TELECOM BROKERS - MD | 2003-10-02 | yes | yes |
| 443-286 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | – | no | yes |
| 443-287 | Verizon VERIZON MARYLAND, INC. | – | no | yes |
| 443-301 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | 2012-04-05 | yes | yes |
| 443-310 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | – | no | yes |
| 443-314 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2011-02-01 | yes | yes |
| 443-320 | Lumen LEVEL 3 COMMUNICATIONS, LLC - MD | – | yes | yes |
| 443-324 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | – | yes | yes |
| 443-326 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | 2001-02-21 | no | yes |
| 443-378 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2004-07-27 | yes | yes |
| 443-386 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | – | yes | yes |
| 443-388 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2006-04-13 | yes | yes |
| 443-392 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - MD | – | yes | yes |
| 443-401 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2011-10-17 | yes | yes |
| 443-413 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | – | yes | yes |
| 443-414 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | – | yes | yes |
| 443-415 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | – | yes | yes |
| 443-416 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | – | yes | yes |
| 443-418 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | – | yes | yes |
| 443-423 | Lumen LEVEL 3 COMMUNICATIONS, LLC - MD | – | yes | yes |
| 443-435 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2011-02-01 | yes | yes |
| 443-438 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2008-10-08 | yes | yes |
| 443-444 | Verizon VERIZON MARYLAND, INC. | – | yes | yes |
| 443-447 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | 2008-12-15 | yes | yes |
| 443-449 | Windstream PAETEC ITEL, LLC | 2007-03-28 | yes | yes |
| 443-451 | Windstream PAETEC ITEL, LLC | – | no | yes |
| 443-452 | Windstream PAETEC ITEL, LLC | 2005-09-07 | yes | yes |
| 443-453 | Onvoy ONVOY, LLC - MD | 2007-10-12 | yes | yes |
| 443-455 | Verizon VERIZON MARYLAND, INC. | 2006-03-09 | yes | yes |
| 443-462 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2008-11-06 | yes | yes |
| 443-463 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | – | yes | yes |
| 443-467 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | 2009-03-20 | yes | yes |
| 443-468 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2007-04-04 | yes | yes |
| 443-469 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | 2009-03-20 | yes | yes |
| 443-473 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2007-03-28 | yes | yes |
| 443-475 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 2011-06-01 | yes | yes |
| 443-478 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2009-03-06 | yes | yes |
| 443-488 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | 2010-06-23 | yes | yes |
| 443-500 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | 2009-03-20 | yes | yes |
| 443-506 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | – | yes | yes |
| 443-509 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2009-02-10 | yes | yes |
| 443-524 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC | – | no | yes |
| 443-525 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | 2009-03-20 | yes | yes |
| 443-527 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2001-03-19 | no | yes |
| 443-529 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2008-07-22 | yes | yes |
| 443-531 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | 2009-03-20 | yes | yes |
| 443-540 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | – | no | yes |
| 443-552 | Verizon VERIZON MARYLAND, INC. | – | yes | yes |
| 443-560 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2011-07-18 | yes | yes |
| 443-562 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | – | no | yes |
| 443-563 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2006-11-14 | yes | yes |
| 443-570 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | – | no | yes |
| 443-571 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2011-12-06 | yes | yes |
| 443-573 | Windstream PAETEC ITEL, LLC | – | yes | yes |
| 443-580 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2011-08-25 | yes | yes |
| 443-602 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2007-02-15 | yes | yes |
| 443-604 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | – | no | yes |
| 443-610 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | – | yes | yes |
| 443-615 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2007-05-10 | yes | yes |
| 443-621 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | – | yes | yes |
| 443-622 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | – | yes | yes |
| 443-627 | Lumen LEVEL 3 COMMUNICATIONS, LLC - MD | – | yes | yes |
| 443-629 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | – | yes | yes |
| 443-630 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2008-05-08 | yes | yes |
| 443-633 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2011-07-18 | yes | yes |
| 443-635 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | 2009-10-14 | yes | yes |
| 443-642 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2006-11-08 | yes | yes |
| 443-651 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2011-07-08 | yes | yes |
| 443-676 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | 2001-06-20 | no | yes |
| 443-677 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2001-03-15 | yes | yes |
| 443-680 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2010-09-27 | yes | yes |
| 443-681 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2009-06-05 | yes | yes |
| 443-682 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2006-12-19 | yes | yes |
| 443-683 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2007-04-09 | yes | yes |
| 443-687 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2009-09-08 | yes | yes |
| 443-690 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | – | no | yes |
| 443-691 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | 2001-01-15 | no | yes |
| 443-692 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC | – | yes | yes |
| 443-695 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | – | no | yes |
| 443-703 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC | – | yes | yes |
| 443-708 | Lumen LEVEL 3 TELECOM OF MARYLAND, LLC - MD | – | yes | yes |
| 443-717 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2005-09-14 | yes | yes |
| 443-721 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2009-07-06 | yes | yes |
| 443-722 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2001-03-09 | no | yes |
| 443-723 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2011-10-06 | yes | yes |
| 443-726 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2011-10-06 | yes | yes |
| 443-739 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2001-07-23 | no | yes |
| 443-740 | Lumen LEVEL 3 COMMUNICATIONS, LLC - MD | 2005-02-03 | yes | yes |
| 443-742 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | – | no | yes |
| 443-743 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2008-04-07 | yes | yes |
| 443-750 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2010-06-08 | yes | yes |
| 443-756 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | – | no | yes |
| 443-759 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2007-10-29 | yes | yes |
| 443-762 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2001-01-10 | yes | yes |
| 443-768 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2001-05-18 | yes | yes |
| 443-769 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2008-09-16 | yes | yes |
| 443-794 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | – | no | yes |
| 443-799 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | 2001-07-23 | no | yes |
| 443-800 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2011-01-31 | yes | yes |
| 443-801 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | – | yes | yes |
| 443-802 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | – | yes | yes |
| 443-803 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | – | yes | yes |
| 443-804 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | – | yes | yes |
| 443-806 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2006-03-08 | yes | yes |
| 443-810 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2008-09-04 | yes | yes |
| 443-813 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2007-09-14 | yes | yes |
| 443-814 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2010-06-15 | yes | yes |
| 443-825 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2006-11-29 | yes | yes |
| 443-826 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2010-06-25 | yes | yes |
| 443-827 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | – | yes | yes |
| 443-829 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | – | yes | yes |
| 443-831 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | – | no | yes |
| 443-835 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2008-12-11 | yes | yes |
| 443-836 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 2013-01-21 | yes | yes |
| 443-838 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | – | no | yes |
| 443-839 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2006-04-17 | yes | yes |
| 443-842 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2011-03-10 | yes | yes |
| 443-844 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2006-02-13 | yes | yes |
| 443-845 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | – | yes | yes |
| 443-850 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2001-09-24 | no | yes |
| 443-853 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2010-07-27 | yes | yes |
| 443-854 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2001-11-19 | no | yes |
| 443-857 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | – | no | yes |
| 443-858 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | – | no | yes |
| 443-863 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2010-08-09 | yes | yes |
| 443-865 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2002-04-19 | yes | yes |
| 443-869 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2006-06-12 | yes | yes |
| 443-872 | Windstream PAETEC ITEL, LLC | – | yes | yes |
| 443-873 | Onvoy ONVOY, LLC - MD | 2010-02-23 | yes | yes |
| 443-874 | Windstream PAETEC ITEL, LLC | – | yes | yes |
| 443-882 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2011-02-01 | yes | yes |
| 443-884 | Windstream PAETEC ITEL, LLC | – | yes | yes |
| 443-885 | Verizon VERIZON MARYLAND, INC. | – | yes | yes |
| 443-890 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2011-08-10 | yes | yes |
| 443-894 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2011-06-30 | yes | yes |
| 443-897 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | 2011-04-12 | yes | yes |
| 443-902 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2011-01-06 | yes | yes |
| 443-904 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2001-10-17 | yes | yes |
| 443-908 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2011-06-29 | yes | yes |
| 443-909 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2006-08-09 | yes | yes |
| 443-913 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2011-06-30 | yes | yes |
| 443-915 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2011-09-07 | yes | yes |
| 443-916 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2011-08-22 | yes | yes |
| 443-919 | Windstream PAETEC ITEL, LLC | – | no | yes |
| 443-923 | Windstream PAETEC ITEL, LLC | 2001-05-11 | no | yes |
| 443-925 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2006-02-24 | yes | yes |
| 443-927 | Lumen LEVEL 3 COMMUNICATIONS, LLC - MD | – | yes | yes |
| 443-928 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2001-09-24 | yes | yes |
| 443-930 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2011-04-06 | yes | yes |
| 443-931 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 2011-10-24 | yes | yes |
| 443-932 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2011-08-22 | yes | yes |
| 443-934 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2007-12-04 | yes | yes |
| 443-938 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2007-08-06 | yes | yes |
| 443-939 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2002-09-23 | yes | yes |
| 443-948 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2011-08-22 | yes | yes |
| 443-954 | Windstream PAETEC ITEL, LLC | 2005-07-06 | yes | yes |
| 443-955 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2006-03-13 | yes | yes |
| 443-956 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | – | no | yes |
| 443-957 | AT&T AT&T - LOCAL | – | yes | yes |
| 443-961 | INTRADO COMMUNICATIONS, LLC | 2014-12-23 | yes | yes |
| 443-963 | Bandwidth BANDWIDTH.COM CLEC, LLC - MD | – | yes | yes |
| 443-965 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2006-06-21 | yes | yes |
| 443-970 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2011-11-21 | yes | yes |
| 443-977 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2006-10-12 | yes | yes |
| 443-982 | YMAX COMMUNICATIONS CORP. - MD | 2007-05-30 | yes | yes |
| 443-983 | T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 2002-07-02 | yes | yes |
| 443-984 | Verizon VERIZON MARYLAND, INC. | – | no | yes |
| 443-986 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 2006-07-13 | yes | yes |
| 443-990 | Bandwidth BANDWIDTH.COM CLEC, LLC - MD | 2011-02-04 | yes | yes |
| 443-992 | Lumen LEVEL 3 COMMUNICATIONS, LLC - MD | – | yes | yes |
| 443-997 | Verizon VERIZON MARYLAND, INC. | – | no | yes |
The holder is who received the block from the numbering administrator. It is not necessarily the carrier serving a given number: numbers move with their owners, and a pooled block is shared.
Who holds the blocks
| Holder | Brand | Blocks | Share here |
|---|---|---|---|
| OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | T-Mobile | 61 | 33% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Verizon | 55 | 29.7% |
| NEW CINGULAR WIRELESS PCS, LLC - DC | AT&T | 26 | 14.1% |
| PAETEC ITEL, LLC | Windstream | 10 | 5.4% |
| VERIZON MARYLAND, INC. | Verizon | 9 | 4.9% |
| LEVEL 3 COMMUNICATIONS, LLC - MD | Lumen | 6 | 3.2% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Verizon | 4 | 2.2% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | Verizon | 3 | 1.6% |
| ONVOY, LLC - MD | Onvoy | 2 | 1.1% |
| BANDWIDTH.COM CLEC, LLC - MD | Bandwidth | 2 | 1.1% |
| CORE COMMUNICATIONS, INC.- MD | – | 1 | 0.5% |
| VDL, INC. DBA GLOBAL TELECOM BROKERS - MD | – | 1 | 0.5% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - MD | AT&T | 1 | 0.5% |
| LEVEL 3 TELECOM OF MARYLAND, LLC - MD | Lumen | 1 | 0.5% |
| AT&T - LOCAL | AT&T | 1 | 0.5% |
| INTRADO COMMUNICATIONS, LLC | – | 1 | 0.5% |
| YMAX COMMUNICATIONS CORP. - MD | – | 1 | 0.5% |
Same rate center in other codes
Overlay codes cover the same geography, so one rate center is served by all of them.
Frequently asked
Which prefixes belong to BALTIMORE in area code 443?
185 blocks: 202, 208, 220, 224, 226, 240, 248, 250, 253, 255, 257, 263 and 173 more, all listed in the table above.
Which carriers have numbers in BALTIMORE?
OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (61 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (55 blocks), NEW CINGULAR WIRELESS PCS, LLC - DC (26 blocks), PAETEC ITEL, LLC (10 blocks), VERIZON MARYLAND, INC. (9 blocks), LEVEL 3 COMMUNICATIONS, LLC - MD (6 blocks). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is BALTIMORE a city?
It is a rate center – the unit NANPA allocates number blocks to. Its name is abbreviated to ten characters and is not necessarily a settlement: we print it as recorded rather than guess at the full name.