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

TAMAROA prefixes in area code 618

NANPA records 3 assigned NXX blocks to rate center TAMAROA in area code 618, 0.4% 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. 2 holders hold those blocks, the largest being LEVEL 3 COMMUNICATIONS, LLC - IL (2), CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL (1). The earliest assignment on record here is 2003-01-02 and the most recent 2005-02-22. 3 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

3 assigned blocks – 0.4% of 618
2 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
618-371 Lumen LEVEL 3 COMMUNICATIONS, LLC - IL 2003-01-02 yes yes
618-385 Lumen LEVEL 3 COMMUNICATIONS, LLC - IL 2005-02-22 yes yes
618-496 Frontier CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL – 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
LEVEL 3 COMMUNICATIONS, LLC - IL Lumen 2 66.7%
CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL Frontier 1 33.3%

Frequently asked

Which prefixes belong to TAMAROA in area code 618?

3 blocks: 371, 385, 496. The table above gives the holder of each.

Which carriers have numbers in TAMAROA?

LEVEL 3 COMMUNICATIONS, LLC - IL (2 blocks), CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -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 TAMAROA 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