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

WINDSOR prefixes in area code 707

NANPA records 10 assigned NXX blocks to rate center WINDSOR in area code 707, 1.3% 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. 7 holders hold those blocks, the largest being PACIFIC BELL (3), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (2), NEW CINGULAR WIRELESS PCS, LLC (1). The earliest assignment on record here is 2001-10-09 and the most recent 2023-05-03. 9 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 codes 217, 252, 369, 440 – overlay codes cover the same geography, so a rate center is served by all of them.

10 assigned blocks – 1.3% of 707
7 holders of record
9 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
707-239 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA – yes yes
707-608 AT&T NEW CINGULAR WIRELESS PCS, LLC 2017-12-12 yes yes
707-620 AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CA – yes yes
707-657 Onvoy ONVOY, LLC - CA – yes yes
707-687 Allstream ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 2001-10-09 yes yes
707-836 AT&T PACIFIC BELL – yes yes
707-837 AT&T PACIFIC BELL – yes yes
707-838 AT&T PACIFIC BELL – no yes
707-892 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 2013-10-15 yes yes
707-970 Dish BOOST SUBSCRIBERCO L.L.C. 2023-05-03 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 30%
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA Verizon 2 20%
NEW CINGULAR WIRELESS PCS, LLC AT&T 1 10%
TELEPORT COMMUNICATIONS AMERICA, LLC - CA AT&T 1 10%
ONVOY, LLC - CA Onvoy 1 10%
ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM Allstream 1 10%
BOOST SUBSCRIBERCO L.L.C. Dish 1 10%

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 WINDSOR in area code 707?

10 blocks: 239, 608, 620, 657, 687, 836, 837, 838, 892, 970. The table above gives the holder of each.

Which carriers have numbers in WINDSOR?

PACIFIC BELL (3 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (2 blocks), NEW CINGULAR WIRELESS PCS, LLC (1 block), TELEPORT COMMUNICATIONS AMERICA, LLC - CA (1 block), ONVOY, LLC - CA (1 block), ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is WINDSOR 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