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

SMITHTOWN prefixes in area code 631

NANPA records 20 assigned NXX blocks to rate center SMITHTOWN in area code 631, 2.6% 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. 8 holders hold those blocks, the largest being VERIZON NEW YORK, INC. (8), OMNIPOINT COMMUNICATIONS, INC. - NY (3), MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY (3). The earliest assignment on record here is 2001-04-04 and the most recent 2021-01-27. 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 code 934 – overlay codes cover the same geography, so a rate center is served by all of them.

20 assigned blocks – 2.6% of 631
8 holders of record
14 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
631-240 Lumen LEVEL 3 COMMUNICATIONS, LLC - NY 2001-10-30 yes yes
631-257 Altice CABLEVISION LIGHTPATH, INC. - NY 2012-05-30 yes yes
631-263 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY – no yes
631-265 Verizon VERIZON NEW YORK, INC. – no yes
631-352 T-Mobile OMNIPOINT COMMUNICATIONS, INC. - NY 2010-08-20 yes yes
631-360 Verizon VERIZON NEW YORK, INC. – no yes
631-361 Verizon VERIZON NEW YORK, INC. – yes yes
631-366 Verizon VERIZON NEW YORK, INC. – yes yes
631-382 Verizon VERIZON NEW YORK, INC. – yes yes
631-406 RCN TELECOM SERVICES, INC. - NY – yes yes
631-652 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 2014-01-13 yes yes
631-656 Altice CABLEVISION LIGHTPATH, INC. - NY – yes yes
631-672 T-Mobile OMNIPOINT COMMUNICATIONS, INC. - NY 2002-06-17 yes yes
631-724 Verizon VERIZON NEW YORK, INC. – no yes
631-780 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY – yes yes
631-863 Verizon VERIZON NEW YORK, INC. – yes yes
631-974 T-Mobile OMNIPOINT COMMUNICATIONS, INC. - NY 2001-04-04 no yes
631-979 Verizon VERIZON NEW YORK, INC. – no yes
631-982 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY – yes yes
631-986 Onvoy ONVOY, LLC- NY 2021-01-27 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 8 40%
OMNIPOINT COMMUNICATIONS, INC. - NY T-Mobile 3 15%
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY Verizon 3 15%
CABLEVISION LIGHTPATH, INC. - NY Altice 2 10%
LEVEL 3 COMMUNICATIONS, LLC - NY Lumen 1 5%
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY Verizon 1 5%
RCN TELECOM SERVICES, INC. - NY – 1 5%
ONVOY, LLC- NY Onvoy 1 5%

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 SMITHTOWN in area code 631?

20 blocks: 240, 257, 263, 265, 352, 360, 361, 366, 382, 406, 652, 656 and 8 more, all listed in the table above.

Which carriers have numbers in SMITHTOWN?

VERIZON NEW YORK, INC. (8 blocks), OMNIPOINT COMMUNICATIONS, INC. - NY (3 blocks), MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY (3 blocks), CABLEVISION LIGHTPATH, INC. - NY (2 blocks), LEVEL 3 COMMUNICATIONS, LLC - NY (1 block), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - 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 SMITHTOWN 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