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

GLENNVILLE prefixes in area code 661

NANPA records 3 assigned NXX blocks to rate center GLENNVILLE in area code 661, 0.4% of the 674 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 LEVEL 3 COMMUNICATIONS, LLC - CA (2), FRONTIER CALIFORNIA INC. (1). 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 code 912 – overlay codes cover the same geography, so a rate center is served by all of them.

3 assigned blocks – 0.4% of 661
2 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
661-455 Lumen LEVEL 3 COMMUNICATIONS, LLC - CA – yes yes
661-536 Frontier FRONTIER CALIFORNIA INC. – yes yes
661-591 Lumen LEVEL 3 COMMUNICATIONS, LLC - CA – 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 - CA Lumen 2 66.7%
FRONTIER CALIFORNIA INC. Frontier 1 33.3%

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 GLENNVILLE in area code 661?

3 blocks: 455, 536, 591. The table above gives the holder of each.

Which carriers have numbers in GLENNVILLE?

LEVEL 3 COMMUNICATIONS, LLC - CA (2 blocks), FRONTIER CALIFORNIA INC. (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is GLENNVILLE 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 661

All 674 prefixes in 661