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

UPPER LAKE prefixes in area code 707

NANPA records 4 assigned NXX blocks to rate center UPPER LAKE in area code 707, 0.5% 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 PACIFIC BELL (1), LEVEL 3 COMMUNICATIONS, LLC - CA (1), ONVOY, LLC - CA (1). The earliest assignment on record here is 2011-06-01 and the most recent 2011-06-01. 4 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

4 assigned blocks – 0.5% of 707
4 holders of record
4 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
707-275 AT&T PACIFIC BELL – yes yes
707-276 Lumen LEVEL 3 COMMUNICATIONS, LLC - CA – yes yes
707-348 Onvoy ONVOY, LLC - CA – yes yes
707-883 Bandwidth BANDWIDTH.COM CLEC, LLC - CA 2011-06-01 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 1 25%
LEVEL 3 COMMUNICATIONS, LLC - CA Lumen 1 25%
ONVOY, LLC - CA Onvoy 1 25%
BANDWIDTH.COM CLEC, LLC - CA Bandwidth 1 25%

Frequently asked

Which prefixes belong to UPPER LAKE in area code 707?

4 blocks: 275, 276, 348, 883. The table above gives the holder of each.

Which carriers have numbers in UPPER LAKE?

PACIFIC BELL (1 block), LEVEL 3 COMMUNICATIONS, LLC - CA (1 block), ONVOY, LLC - CA (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 UPPER LAKE 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