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

KELSEYVL prefixes in area code 707

NANPA records 6 assigned NXX blocks to rate center KELSEYVL in area code 707, 0.8% of the 785 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 PACIFIC BELL (3), ONVOY, LLC - CA (2), LEVEL 3 COMMUNICATIONS, LLC - CA (1). 6 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

6 assigned blocks – 0.8% of 707
3 holders of record
6 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
707-277 AT&T PACIFIC BELL – yes yes
707-278 AT&T PACIFIC BELL – yes yes
707-279 AT&T PACIFIC BELL – yes yes
707-281 Lumen LEVEL 3 COMMUNICATIONS, LLC - CA – yes yes
707-289 Onvoy ONVOY, LLC - CA – yes yes
707-587 Onvoy ONVOY, 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
PACIFIC BELL AT&T 3 50%
ONVOY, LLC - CA Onvoy 2 33.3%
LEVEL 3 COMMUNICATIONS, LLC - CA Lumen 1 16.7%

Frequently asked

Which prefixes belong to KELSEYVL in area code 707?

6 blocks: 277, 278, 279, 281, 289, 587. The table above gives the holder of each.

Which carriers have numbers in KELSEYVL?

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

Is KELSEYVL 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 707

All 785 prefixes in 707