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

GRANT PARK prefixes in area code 815

NANPA records 4 assigned NXX blocks to rate center GRANT PARK in area code 815, 0.5% 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 ILLINOIS BELL TEL CO (2), LEVEL 3 COMMUNICATIONS, LLC - IL (2). The earliest assignment on record here is 2002-04-02 and the most recent 2002-04-02. 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 code 779 – overlay codes cover the same geography, so a rate center is served by all of them.

4 assigned blocks – 0.5% of 815
2 holders of record
4 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
815-465 AT&T ILLINOIS BELL TEL CO – yes yes
815-466 AT&T ILLINOIS BELL TEL CO – yes yes
815-550 Lumen LEVEL 3 COMMUNICATIONS, LLC - IL – yes yes
815-605 Lumen LEVEL 3 COMMUNICATIONS, LLC - IL 2002-04-02 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
ILLINOIS BELL TEL CO AT&T 2 50%
LEVEL 3 COMMUNICATIONS, LLC - IL Lumen 2 50%

Frequently asked

Which prefixes belong to GRANT PARK in area code 815?

4 blocks: 465, 466, 550, 605. The table above gives the holder of each.

Which carriers have numbers in GRANT PARK?

ILLINOIS BELL TEL CO (2 blocks), LEVEL 3 COMMUNICATIONS, LLC - IL (2 blocks). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is GRANT PARK 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