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

MARTINSBG prefixes in area code 304

NANPA records 21 assigned NXX blocks to rate center MARTINSBG in area code 304, 2.7% 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 FRONTIER WEST VIRGINIA INC. (6), NEW CINGULAR WIRELESS PCS, LLC - DC (5), UNITED STATES CELLULAR - WV (4). The earliest assignment on record here is 2001-04-16 and the most recent 2010-03-30. 14 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 573, 641, 681, 740 – overlay codes cover the same geography, so a rate center is served by all of them.

21 assigned blocks – 2.7% of 304
7 holders of record
14 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
304-260 Frontier FRONTIER WEST VIRGINIA INC. – no yes
304-261 AT&T NEW CINGULAR WIRELESS PCS, LLC - DC – no yes
304-262 Frontier FRONTIER WEST VIRGINIA INC. – no yes
304-263 Frontier FRONTIER WEST VIRGINIA INC. – no yes
304-264 Frontier FRONTIER WEST VIRGINIA INC. – no yes
304-267 Frontier FRONTIER WEST VIRGINIA INC. – no yes
304-268 AT&T NEW CINGULAR WIRELESS PCS, LLC - DC – yes yes
304-350 T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 2010-03-30 yes yes
304-378 Comcast COMCAST IP PHONE, LLC – no yes
304-433 Frontier FRONTIER WEST VIRGINIA INC. – yes yes
304-579 AT&T NEW CINGULAR WIRELESS PCS, LLC - DC – yes yes
304-582 UNITED STATES CELLULAR - WV 2001-04-16 yes yes
304-596 AT&T NEW CINGULAR WIRELESS PCS, LLC - DC 2002-03-15 yes yes
304-616 T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 2004-03-16 yes yes
304-620 T-Mobile OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC – yes yes
304-671 UNITED STATES CELLULAR - WV – yes yes
304-676 UNITED STATES CELLULAR - WV – yes yes
304-702 UNITED STATES CELLULAR - WV – yes yes
304-707 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC 2007-02-08 yes yes
304-839 AT&T NEW CINGULAR WIRELESS PCS, LLC - DC – yes yes
304-901 CITYNET WEST VIRGINIA, LLC - WV 2007-10-19 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
FRONTIER WEST VIRGINIA INC. Frontier 6 28.6%
NEW CINGULAR WIRELESS PCS, LLC - DC AT&T 5 23.8%
UNITED STATES CELLULAR - WV – 4 19%
OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC T-Mobile 3 14.3%
COMCAST IP PHONE, LLC Comcast 1 4.8%
MCIMETRO ACCESS TRANSMISSION SERVICES LLC Verizon 1 4.8%
CITYNET WEST VIRGINIA, LLC - WV – 1 4.8%

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 MARTINSBG in area code 304?

21 blocks: 260, 261, 262, 263, 264, 267, 268, 350, 378, 433, 579, 582 and 9 more, all listed in the table above.

Which carriers have numbers in MARTINSBG?

FRONTIER WEST VIRGINIA INC. (6 blocks), NEW CINGULAR WIRELESS PCS, LLC - DC (5 blocks), UNITED STATES CELLULAR - WV (4 blocks), OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (3 blocks), COMCAST IP PHONE, LLC (1 block), MCIMETRO ACCESS TRANSMISSION SERVICES LLC (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is MARTINSBG 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 304

All 785 prefixes in 304