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

FRANKFORT prefixes in area code 815

NANPA records 6 assigned NXX blocks to rate center FRANKFORT in area code 815, 0.8% 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 ILLINOIS BELL TEL CO (3), LEVEL 3 COMMUNICATIONS, LLC - IL (2), TELEPORT COMMUNICATIONS AMERICA, LLC - IL (1). 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 codes 231, 502, 740, 765 – overlay codes cover the same geography, so a rate center is served by all of them.

6 assigned blocks – 0.8% of 815
3 holders of record
4 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
815-277 AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - IL – yes yes
815-412 Lumen LEVEL 3 COMMUNICATIONS, LLC - IL – yes yes
815-464 AT&T ILLINOIS BELL TEL CO – no yes
815-469 AT&T ILLINOIS BELL TEL CO – no yes
815-534 Lumen LEVEL 3 COMMUNICATIONS, LLC - IL – yes yes
815-806 AT&T ILLINOIS BELL TEL CO – 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 3 50%
LEVEL 3 COMMUNICATIONS, LLC - IL Lumen 2 33.3%
TELEPORT COMMUNICATIONS AMERICA, LLC - IL AT&T 1 16.7%

Same rate center in other codes

Overlay codes cover the same geography, so one rate center is served by all of them.

Frequently asked

Which prefixes belong to FRANKFORT in area code 815?

6 blocks: 277, 412, 464, 469, 534, 806. The table above gives the holder of each.

Which carriers have numbers in FRANKFORT?

ILLINOIS BELL TEL CO (3 blocks), LEVEL 3 COMMUNICATIONS, LLC - IL (2 blocks), TELEPORT COMMUNICATIONS AMERICA, 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 FRANKFORT 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