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

MONTE RIO prefixes in area code 707

NANPA records 3 assigned NXX blocks to rate center MONTE RIO in area code 707, 0.4% 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 BANDWIDTH.COM CLEC, LLC - CA (1), ONVOY, LLC - CA (1), PACIFIC BELL (1). The earliest assignment on record here is 2015-09-04 and the most recent 2015-09-04. 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 369 – overlay codes cover the same geography, so a rate center is served by all of them.

3 assigned blocks – 0.4% of 707
3 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
707-314 Bandwidth BANDWIDTH.COM CLEC, LLC - CA 2015-09-04 yes yes
707-520 Onvoy ONVOY, LLC - CA – yes yes
707-865 AT&T PACIFIC BELL – 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
BANDWIDTH.COM CLEC, LLC - CA Bandwidth 1 33.3%
ONVOY, LLC - CA Onvoy 1 33.3%
PACIFIC BELL AT&T 1 33.3%

Frequently asked

Which prefixes belong to MONTE RIO in area code 707?

3 blocks: 314, 520, 865. The table above gives the holder of each.

Which carriers have numbers in MONTE RIO?

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

Is MONTE RIO 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