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

LANARK prefixes in area code 815

NANPA records 3 assigned NXX blocks to rate center LANARK in area code 815, 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. 3 holders hold those blocks, the largest being CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL (1), ONVOY, LLC (1), AERO NORTH COMMUNICATIONS, INC. - IL (1). The earliest assignment on record here is 2006-07-18 and the most recent 2018-08-01. 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 code 779 – overlay codes cover the same geography, so a rate center is served by all of them.

3 assigned blocks – 0.4% of 815
3 holders of record
2 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
815-493 Frontier CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL – yes yes
815-551 Onvoy ONVOY, LLC 2018-08-01 yes yes
815-952 AERO NORTH COMMUNICATIONS, INC. - IL 2006-07-18 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
CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL Frontier 1 33.3%
ONVOY, LLC Onvoy 1 33.3%
AERO NORTH COMMUNICATIONS, INC. - IL – 1 33.3%

Frequently asked

Which prefixes belong to LANARK in area code 815?

3 blocks: 493, 551, 952. The table above gives the holder of each.

Which carriers have numbers in LANARK?

CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL (1 block), ONVOY, LLC (1 block), AERO NORTH COMMUNICATIONS, INC. - 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 LANARK 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 815

All 786 prefixes in 815