NumberingData
Verified Nov 1, 2026 · Source: NANPA CO Code Assignment Records

ABERDEEN prefixes in area code 443

NANPA records 15 assigned NXX blocks to rate center ABERDEEN in area code 443, 1.9% 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. 7 holders hold those blocks, the largest being LEVEL 3 COMMUNICATIONS, LLC - MD (3), PAETEC ITEL, LLC (3), MCIMETRO ACCESS TRANSMISSION SERVICES LLC (3). The earliest assignment on record here is 2001-01-15 and the most recent 2012-11-27. 15 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 208, 326, 360, 410 – overlay codes cover the same geography, so a rate center is served by all of them.

15 assigned blocks – 1.9% of 443
7 holders of record
15 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
443-303 Lumen LEVEL 3 COMMUNICATIONS, LLC - MD – yes yes
443-327 Windstream PAETEC ITEL, LLC – yes yes
443-345 Lumen LEVEL 3 COMMUNICATIONS, LLC - MD – yes yes
443-360 AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - MD – yes yes
443-374 Windstream PAETEC ITEL, LLC – yes yes
443-395 Verizon VERIZON MARYLAND, INC. 2009-08-13 yes yes
443-403 Lumen LEVEL 3 COMMUNICATIONS, LLC - MD 2001-06-20 yes yes
443-558 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC 2001-01-15 yes yes
443-707 T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC – yes yes
443-720 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC 2012-11-27 yes yes
443-760 AT&T AT&T - LOCAL – yes yes
443-779 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC – yes yes
443-788 T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC – yes yes
443-855 Windstream PAETEC ITEL, LLC 2005-05-20 yes yes
443-861 Verizon VERIZON MARYLAND, INC. 2009-08-13 yes 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

HolderBrandBlocksShare here
LEVEL 3 COMMUNICATIONS, LLC - MD Lumen 3 20%
PAETEC ITEL, LLC Windstream 3 20%
MCIMETRO ACCESS TRANSMISSION SERVICES LLC Verizon 3 20%
VERIZON MARYLAND, INC. Verizon 2 13.3%
OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC T-Mobile 2 13.3%
TELEPORT COMMUNICATIONS AMERICA, LLC - MD AT&T 1 6.7%
AT&T - LOCAL AT&T 1 6.7%

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 ABERDEEN in area code 443?

15 blocks: 303, 327, 345, 360, 374, 395, 403, 558, 707, 720, 760, 779 and 3 more, all listed in the table above.

Which carriers have numbers in ABERDEEN?

LEVEL 3 COMMUNICATIONS, LLC - MD (3 blocks), PAETEC ITEL, LLC (3 blocks), MCIMETRO ACCESS TRANSMISSION SERVICES LLC (3 blocks), VERIZON MARYLAND, INC. (2 blocks), OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (2 blocks), TELEPORT COMMUNICATIONS AMERICA, LLC - MD (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is ABERDEEN 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.

Other rate centers in 443

All 785 prefixes in 443