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

PLYMOUTH prefixes in area code 603

NANPA records 10 assigned NXX blocks to rate center PLYMOUTH in area code 603, 1.3% of the 752 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. 9 holders hold those blocks, the largest being PAETEC ITEL, LLC (2), UNITED STATES CELLULAR - NH (1), HD CARRIER LLC (1). The earliest assignment on record here is 2002-08-09 and the most recent 2002-08-09. 8 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, 209, 252, 272 – overlay codes cover the same geography, so a rate center is served by all of them.

10 assigned blocks – 1.3% of 603
9 holders of record
8 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
603-238 Windstream PAETEC ITEL, LLC – yes yes
603-254 UNITED STATES CELLULAR - NH – yes yes
603-346 HD CARRIER LLC – yes yes
603-412 T-Mobile OMNIPOINT MIAMI E LICENSE, LLC – yes yes
603-481 BELL ATLANTIC MOBILE, INC – yes yes
603-535 Windstream PAETEC ITEL, LLC – no yes
603-536 Consolidated CONSOLIDATED COMM OF NO. NEW ENGLAND-NH – no yes
603-779 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH – yes yes
603-947 FREEDOM RING COMMUNICATIONS, LLC – yes yes
603-996 T-Mobile METROPCS, INC. 2002-08-09 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
PAETEC ITEL, LLC Windstream 2 20%
UNITED STATES CELLULAR - NH – 1 10%
HD CARRIER LLC – 1 10%
OMNIPOINT MIAMI E LICENSE, LLC T-Mobile 1 10%
BELL ATLANTIC MOBILE, INC – 1 10%
CONSOLIDATED COMM OF NO. NEW ENGLAND-NH Consolidated 1 10%
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH Verizon 1 10%
FREEDOM RING COMMUNICATIONS, LLC – 1 10%
METROPCS, INC. T-Mobile 1 10%

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 PLYMOUTH in area code 603?

10 blocks: 238, 254, 346, 412, 481, 535, 536, 779, 947, 996. The table above gives the holder of each.

Which carriers have numbers in PLYMOUTH?

PAETEC ITEL, LLC (2 blocks), UNITED STATES CELLULAR - NH (1 block), HD CARRIER LLC (1 block), OMNIPOINT MIAMI E LICENSE, LLC (1 block), BELL ATLANTIC MOBILE, INC (1 block), CONSOLIDATED COMM OF NO. NEW ENGLAND-NH (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is PLYMOUTH 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 603

All 752 prefixes in 603