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

ESSEX prefixes in area code 860

NANPA records 3 assigned NXX blocks to rate center ESSEX in area code 860, 0.4% of the 783 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. 3 holders hold those blocks, the largest being TELEPORT COMMUNICATIONS AMERICA, LLC - CT (1), METROPCS, INC. (1), SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT (1). 2 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 351, 410, 443, 573 – overlay codes cover the same geography, so a rate center is served by all of them.

3 assigned blocks – 0.4% of 860
3 holders of record
2 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
860-581 AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CT – yes yes
860-662 T-Mobile METROPCS, INC. – yes yes
860-767 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
TELEPORT COMMUNICATIONS AMERICA, LLC - CT AT&T 1 33.3%
METROPCS, INC. T-Mobile 1 33.3%
SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT AT&T 1 33.3%

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 ESSEX in area code 860?

3 blocks: 581, 662, 767. The table above gives the holder of each.

Which carriers have numbers in ESSEX?

TELEPORT COMMUNICATIONS AMERICA, LLC - CT (1 block), METROPCS, INC. (1 block), SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is ESSEX 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 860

All 783 prefixes in 860