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

SHERRARD prefixes in area code 309

NANPA records 3 assigned NXX blocks to rate center SHERRARD in area code 309, 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), MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL (1). The earliest assignment on record here is 2001-10-29 and the most recent 2001-10-29. 2 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 309
3 holders of record
2 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
309-593 Frontier CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL – no yes
309-602 Onvoy ONVOY, LLC – yes yes
309-720 MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 2001-10-29 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
CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL Frontier 1 33.3%
ONVOY, LLC Onvoy 1 33.3%
MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL – 1 33.3%

Frequently asked

Which prefixes belong to SHERRARD in area code 309?

3 blocks: 593, 602, 720. The table above gives the holder of each.

Which carriers have numbers in SHERRARD?

CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL (1 block), ONVOY, LLC (1 block), MEDIACOM TELEPHONY OF ILLINOIS, 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 SHERRARD 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 309

All 786 prefixes in 309