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

SONOMA prefixes in area code 707

NANPA records 16 assigned NXX blocks to rate center SONOMA in area code 707, 2.0% 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. 9 holders hold those blocks, the largest being PACIFIC BELL (5), ONVOY, LLC - CA (3), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (2). The earliest assignment on record here is 2016-03-03 and the most recent 2022-10-12. 13 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.

16 assigned blocks – 2% of 707
9 holders of record
13 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
707-210 Onvoy ONVOY, LLC - CA 2016-03-03 yes yes
707-231 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 2020-01-17 yes yes
707-309 INTEGRATED PATH COMMUNICATIONS, LLC - CA – yes yes
707-343 Onvoy ONVOY, LLC - CA – yes yes
707-509 IP HORIZON LLC – yes yes
707-721 TPx U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS – yes yes
707-732 T-Mobile METROPCS, INC. – yes yes
707-931 AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CA – yes yes
707-933 AT&T PACIFIC BELL – yes yes
707-934 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC – yes yes
707-935 AT&T PACIFIC BELL – no yes
707-938 AT&T PACIFIC BELL – yes yes
707-939 AT&T PACIFIC BELL – yes yes
707-940 Onvoy ONVOY, LLC - CA – no yes
707-991 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 2022-10-12 yes yes
707-996 AT&T PACIFIC BELL – no 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 5 31.2%
ONVOY, LLC - CA Onvoy 3 18.8%
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA Verizon 2 12.5%
INTEGRATED PATH COMMUNICATIONS, LLC - CA – 1 6.2%
IP HORIZON LLC – 1 6.2%
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS TPx 1 6.2%
METROPCS, INC. T-Mobile 1 6.2%
TELEPORT COMMUNICATIONS AMERICA, LLC - CA AT&T 1 6.2%
MCIMETRO ACCESS TRANSMISSION SERVICES LLC Verizon 1 6.2%

Frequently asked

Which prefixes belong to SONOMA in area code 707?

16 blocks: 210, 231, 309, 343, 509, 721, 732, 931, 933, 934, 935, 938 and 4 more, all listed in the table above.

Which carriers have numbers in SONOMA?

PACIFIC BELL (5 blocks), ONVOY, LLC - CA (3 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (2 blocks), INTEGRATED PATH COMMUNICATIONS, LLC - CA (1 block), IP HORIZON LLC (1 block), U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is SONOMA 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