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

NAUGATUCK prefixes in area code 203

NANPA records 6 assigned NXX blocks to rate center NAUGATUCK in area code 203, 0.8% of the 784 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. 4 holders hold those blocks, the largest being SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT (3), TELEPORT COMMUNICATIONS AMERICA, LLC - CT (1), PAETEC ITEL, LLC (1). 5 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 475 – overlay codes cover the same geography, so a rate center is served by all of them.

6 assigned blocks – 0.8% of 203
4 holders of record
5 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
203-490 AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CT – yes yes
203-632 Windstream PAETEC ITEL, LLC – yes yes
203-714 Charter ONVOY SPECTRUM, LLC – yes yes
203-720 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – yes yes
203-723 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – yes yes
203-729 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – no 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
SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT AT&T 3 50%
TELEPORT COMMUNICATIONS AMERICA, LLC - CT AT&T 1 16.7%
PAETEC ITEL, LLC Windstream 1 16.7%
ONVOY SPECTRUM, LLC Charter 1 16.7%

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 NAUGATUCK in area code 203?

6 blocks: 490, 632, 714, 720, 723, 729. The table above gives the holder of each.

Which carriers have numbers in NAUGATUCK?

SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT (3 blocks), TELEPORT COMMUNICATIONS AMERICA, LLC - CT (1 block), PAETEC ITEL, LLC (1 block), ONVOY SPECTRUM, 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 NAUGATUCK 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 203

All 784 prefixes in 203