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

MENDOCINO prefixes in area code 707

NANPA records 5 assigned NXX blocks to rate center MENDOCINO in area code 707, 0.6% 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. 4 holders hold those blocks, the largest being ONVOY, LLC - CA (2), LEVEL 3 COMMUNICATIONS, LLC - CA (1), PACIFIC BELL (1). The earliest assignment on record here is 2015-05-27 and the most recent 2015-05-27. 5 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 369 – overlay codes cover the same geography, so a rate center is served by all of them.

5 assigned blocks – 0.6% of 707
4 holders of record
5 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
707-202 Lumen LEVEL 3 COMMUNICATIONS, LLC - CA – yes yes
707-397 Onvoy ONVOY, LLC - CA – yes yes
707-593 Onvoy ONVOY, LLC - CA – yes yes
707-937 AT&T PACIFIC BELL – yes yes
707-979 Bandwidth BANDWIDTH.COM CLEC, LLC - CA 2015-05-27 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
ONVOY, LLC - CA Onvoy 2 40%
LEVEL 3 COMMUNICATIONS, LLC - CA Lumen 1 20%
PACIFIC BELL AT&T 1 20%
BANDWIDTH.COM CLEC, LLC - CA Bandwidth 1 20%

Frequently asked

Which prefixes belong to MENDOCINO in area code 707?

5 blocks: 202, 397, 593, 937, 979. The table above gives the holder of each.

Which carriers have numbers in MENDOCINO?

ONVOY, LLC - CA (2 blocks), LEVEL 3 COMMUNICATIONS, LLC - CA (1 block), PACIFIC BELL (1 block), BANDWIDTH.COM CLEC, 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 MENDOCINO 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