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

LOMITA prefixes in area code 310

NANPA records 14 assigned NXX blocks to rate center LOMITA in area code 310, 1.8% of the 786 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. 6 holders hold those blocks, the largest being PACIFIC BELL (9), ONVOY, LLC - CA (1), MCIMETRO ACCESS TRANSMISSION SERVICES LLC (1). The earliest assignment on record here is 2005-01-03 and the most recent 2023-06-26. 5 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 424 – overlay codes cover the same geography, so a rate center is served by all of them.

14 assigned blocks – 1.8% of 310
6 holders of record
5 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
310-257 AT&T PACIFIC BELL – no yes
310-304 Onvoy ONVOY, LLC - CA 2023-06-26 yes yes
310-325 AT&T PACIFIC BELL – no yes
310-326 AT&T PACIFIC BELL – no yes
310-517 AT&T PACIFIC BELL – no yes
310-530 AT&T PACIFIC BELL – no yes
310-534 AT&T PACIFIC BELL – no yes
310-539 AT&T PACIFIC BELL – no yes
310-602 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC – yes yes
310-626 Lumen LEVEL 3 COMMUNICATIONS, LLC - CA – yes yes
310-784 AT&T PACIFIC BELL – no yes
310-891 AT&T PACIFIC BELL – no yes
310-986 T-Mobile T-MOBILE USA, INC. 2005-01-03 yes yes
310-997 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA – 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 9 64.3%
ONVOY, LLC - CA Onvoy 1 7.1%
MCIMETRO ACCESS TRANSMISSION SERVICES LLC Verizon 1 7.1%
LEVEL 3 COMMUNICATIONS, LLC - CA Lumen 1 7.1%
T-MOBILE USA, INC. T-Mobile 1 7.1%
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA Verizon 1 7.1%

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 LOMITA in area code 310?

14 blocks: 257, 304, 325, 326, 517, 530, 534, 539, 602, 626, 784, 891 and 2 more, all listed in the table above.

Which carriers have numbers in LOMITA?

PACIFIC BELL (9 blocks), ONVOY, LLC - CA (1 block), MCIMETRO ACCESS TRANSMISSION SERVICES LLC (1 block), LEVEL 3 COMMUNICATIONS, LLC - CA (1 block), T-MOBILE USA, INC. (1 block), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - 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 LOMITA 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 310

All 786 prefixes in 310