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

SO PLACER prefixes in area code 916

NANPA records 25 assigned NXX blocks to rate center SO PLACER in area code 916, 3.2% 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. 10 holders hold those blocks, the largest being PACIFIC BELL (10), NEW CINGULAR WIRELESS PCS, LLC (3), ONVOY, LLC - CA (2). The earliest assignment on record here is 2002-03-22 and the most recent 2021-12-17. 19 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 279 – overlay codes cover the same geography, so a rate center is served by all of them.

25 assigned blocks – 3.2% of 916
10 holders of record
19 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
916-250 AT&T NEW CINGULAR WIRELESS PCS, LLC 2015-07-06 yes yes
916-251 MATRIX TELECOM, LLC. S/I/I TNCI - CA – yes yes
916-259 Onvoy ONVOY, LLC - CA – yes yes
916-276 T-Mobile METROPCS, INC. – yes yes
916-303 Lumen LEVEL 3 COMMUNICATIONS, LLC - CA – yes yes
916-315 AT&T PACIFIC BELL – no yes
916-316 AT&T NEW CINGULAR WIRELESS PCS, LLC – no yes
916-415 AT&T PACIFIC BELL – yes yes
916-435 AT&T PACIFIC BELL – yes yes
916-577 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC – yes yes
916-624 AT&T PACIFIC BELL – no yes
916-625 AT&T PACIFIC BELL – yes yes
916-626 FIDIUM ENTERPRISE SERVICES, LLC – yes yes
916-630 AT&T PACIFIC BELL – no yes
916-632 AT&T PACIFIC BELL – no yes
916-652 AT&T PACIFIC BELL – no yes
916-659 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 2020-04-24 yes yes
916-660 AT&T PACIFIC BELL – yes yes
916-663 AT&T PACIFIC BELL – yes yes
916-672 FIDIUM ENTERPRISE SERVICES, LLC 2005-10-31 yes yes
916-741 T-Mobile METROPCS, INC. 2002-03-22 yes yes
916-778 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA – yes yes
916-824 AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CA – yes yes
916-938 AT&T NEW CINGULAR WIRELESS PCS, LLC 2021-12-17 yes yes
916-975 Onvoy ONVOY, LLC - CA 2016-02-11 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 10 40%
NEW CINGULAR WIRELESS PCS, LLC AT&T 3 12%
ONVOY, LLC - CA Onvoy 2 8%
METROPCS, INC. T-Mobile 2 8%
FIDIUM ENTERPRISE SERVICES, LLC – 2 8%
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA Verizon 2 8%
MATRIX TELECOM, LLC. S/I/I TNCI - CA – 1 4%
LEVEL 3 COMMUNICATIONS, LLC - CA Lumen 1 4%
MCIMETRO ACCESS TRANSMISSION SERVICES LLC Verizon 1 4%
TELEPORT COMMUNICATIONS AMERICA, LLC - CA AT&T 1 4%

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 SO PLACER in area code 916?

25 blocks: 250, 251, 259, 276, 303, 315, 316, 415, 435, 577, 624, 625 and 13 more, all listed in the table above.

Which carriers have numbers in SO PLACER?

PACIFIC BELL (10 blocks), NEW CINGULAR WIRELESS PCS, LLC (3 blocks), ONVOY, LLC - CA (2 blocks), METROPCS, INC. (2 blocks), FIDIUM ENTERPRISE SERVICES, LLC (2 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (2 blocks). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is SO PLACER 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 916

All 785 prefixes in 916