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

MOUNT ZION prefixes in area code 217

NANPA records 3 assigned NXX blocks to rate center MOUNT ZION in area code 217, 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 LEVEL 3 COMMUNICATIONS, LLC - IL (1), COMCAST IP PHONE, LLC (1), FRONTIER NORTH, INC. - IL (1). The earliest assignment on record here is 2003-01-02 and the most recent 2007-08-21. 3 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 447, 608 – overlay codes cover the same geography, so a rate center is served by all of them.

3 assigned blocks – 0.4% of 217
3 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
217-350 Lumen LEVEL 3 COMMUNICATIONS, LLC - IL 2003-01-02 yes yes
217-571 Comcast COMCAST IP PHONE, LLC 2007-08-21 yes yes
217-864 Frontier FRONTIER NORTH, INC. - 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 1 33.3%
COMCAST IP PHONE, LLC Comcast 1 33.3%
FRONTIER NORTH, INC. - IL Frontier 1 33.3%

Frequently asked

Which prefixes belong to MOUNT ZION in area code 217?

3 blocks: 350, 571, 864. The table above gives the holder of each.

Which carriers have numbers in MOUNT ZION?

LEVEL 3 COMMUNICATIONS, LLC - IL (1 block), COMCAST IP PHONE, LLC (1 block), FRONTIER NORTH, 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 MOUNT ZION 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 217

All 786 prefixes in 217