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

NORTHPORT prefixes in area code 631

NANPA records 12 assigned NXX blocks to rate center NORTHPORT in area code 631, 1.5% of the 782 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. 6 holders hold those blocks, the largest being VERIZON NEW YORK, INC. (5), CSC VOICE, LLC (2), MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY (2). The earliest assignment on record here is 2002-06-17 and the most recent 2009-04-17. 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 231, 509, 934 – overlay codes cover the same geography, so a rate center is served by all of them.

12 assigned blocks – 1.5% of 631
6 holders of record
8 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
631-239 AT&T TC SYSTEMS, INC. - NY – yes yes
631-261 Verizon VERIZON NEW YORK, INC. – no yes
631-262 Verizon VERIZON NEW YORK, INC. – no yes
631-606 CSC VOICE, LLC 2009-04-17 yes yes
631-628 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY – yes yes
631-651 CSC VOICE, LLC – yes yes
631-754 Verizon VERIZON NEW YORK, INC. – no yes
631-757 Verizon VERIZON NEW YORK, INC. – no yes
631-837 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY – yes yes
631-896 T-Mobile METROPCS, INC. 2002-06-17 yes yes
631-912 Verizon VERIZON NEW YORK, INC. – yes yes
631-925 Lumen LEVEL 3 COMMUNICATIONS, LLC - NY – 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
VERIZON NEW YORK, INC. Verizon 5 41.7%
CSC VOICE, LLC – 2 16.7%
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY Verizon 2 16.7%
TC SYSTEMS, INC. - NY AT&T 1 8.3%
METROPCS, INC. T-Mobile 1 8.3%
LEVEL 3 COMMUNICATIONS, LLC - NY Lumen 1 8.3%

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 NORTHPORT in area code 631?

12 blocks: 239, 261, 262, 606, 628, 651, 754, 757, 837, 896, 912, 925. The table above gives the holder of each.

Which carriers have numbers in NORTHPORT?

VERIZON NEW YORK, INC. (5 blocks), CSC VOICE, LLC (2 blocks), MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY (2 blocks), TC SYSTEMS, INC. - NY (1 block), METROPCS, INC. (1 block), LEVEL 3 COMMUNICATIONS, LLC - NY (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is NORTHPORT 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 631

All 782 prefixes in 631