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

CUMBERLAND prefixes in area code 240

NANPA records 16 assigned NXX blocks to rate center CUMBERLAND in area code 240, 2.0% 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. 8 holders hold those blocks, the largest being OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (4), NEW CINGULAR WIRELESS PCS, LLC - DC (3), VERIZON MARYLAND, INC. (2). The earliest assignment on record here is 2001-05-03 and the most recent 2021-09-01. 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 207, 227, 301, 317 – overlay codes cover the same geography, so a rate center is served by all of them.

16 assigned blocks – 2% of 240
8 holders of record
15 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
240-362 Verizon VERIZON MARYLAND, INC. – yes yes
240-378 CORE COMMUNICATIONS, INC.- MD – no yes
240-410 T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 2021-01-13 yes yes
240-522 T-Mobile METROPCS, INC. 2001-12-12 yes yes
240-580 T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 2001-06-14 yes yes
240-609 AT&T NEW CINGULAR WIRELESS PCS, LLC - DC 2014-09-11 yes yes
240-664 Peerless PEERLESS NETWORK OF MARYLAND, LLC 2019-03-06 yes yes
240-727 AT&T NEW CINGULAR WIRELESS PCS, LLC - DC – yes yes
240-803 AT&T NEW CINGULAR WIRELESS PCS, LLC - DC 2012-01-27 yes yes
240-807 T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 2021-09-01 yes yes
240-860 Peerless PEERLESS NETWORK OF MARYLAND, LLC 2016-08-23 yes yes
240-916 T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC – yes yes
240-920 Lumen LEVEL 3 COMMUNICATIONS, LLC - MD 2001-05-03 yes yes
240-964 Verizon VERIZON MARYLAND, INC. 2008-05-27 yes yes
240-967 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD – yes yes
240-979 Lumen LEVEL 3 COMMUNICATIONS, LLC - MD – 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
OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC T-Mobile 4 25%
NEW CINGULAR WIRELESS PCS, LLC - DC AT&T 3 18.8%
VERIZON MARYLAND, INC. Verizon 2 12.5%
PEERLESS NETWORK OF MARYLAND, LLC Peerless 2 12.5%
LEVEL 3 COMMUNICATIONS, LLC - MD Lumen 2 12.5%
CORE COMMUNICATIONS, INC.- MD – 1 6.2%
METROPCS, INC. T-Mobile 1 6.2%
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD Verizon 1 6.2%

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 CUMBERLAND in area code 240?

16 blocks: 362, 378, 410, 522, 580, 609, 664, 727, 803, 807, 860, 916 and 4 more, all listed in the table above.

Which carriers have numbers in CUMBERLAND?

OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (4 blocks), NEW CINGULAR WIRELESS PCS, LLC - DC (3 blocks), VERIZON MARYLAND, INC. (2 blocks), PEERLESS NETWORK OF MARYLAND, LLC (2 blocks), LEVEL 3 COMMUNICATIONS, LLC - MD (2 blocks), CORE COMMUNICATIONS, INC.- 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 CUMBERLAND 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 240

All 785 prefixes in 240