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

FAIRFIELD prefixes in area code 618

NANPA records 5 assigned NXX blocks to rate center FAIRFIELD in area code 618, 0.6% of the 786 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 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (2), FRONTIER NORTH, INC. - IL (2), NEW CINGULAR WIRELESS PCS, LLC - IL (1). The earliest assignment on record here is 2001-12-06 and the most recent 2002-08-09. 4 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 203, 207, 208, 223 – overlay codes cover the same geography, so a rate center is served by all of them.

5 assigned blocks – 0.6% of 618
3 holders of record
4 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
618-516 AT&T NEW CINGULAR WIRELESS PCS, LLC - IL 2001-12-06 yes yes
618-599 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL – no yes
618-842 Frontier FRONTIER NORTH, INC. - IL – yes yes
618-847 Frontier FRONTIER NORTH, INC. - IL – yes yes
618-919 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 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
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL Verizon 2 40%
FRONTIER NORTH, INC. - IL Frontier 2 40%
NEW CINGULAR WIRELESS PCS, LLC - IL AT&T 1 20%

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 FAIRFIELD in area code 618?

5 blocks: 516, 599, 842, 847, 919. The table above gives the holder of each.

Which carriers have numbers in FAIRFIELD?

CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL (2 blocks), FRONTIER NORTH, INC. - IL (2 blocks), NEW CINGULAR WIRELESS PCS, LLC - IL (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is FAIRFIELD 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 618

All 786 prefixes in 618