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

JOSHUATREE prefixes in area code 760

NANPA records 3 assigned NXX blocks to rate center JOSHUATREE in area code 760, 0.4% 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. 3 holders hold those blocks, the largest being FRONTIER CALIFORNIA INC. (1), ONVOY, LLC - CA (1), LEVEL 3 COMMUNICATIONS, LLC - CA (1). The earliest assignment on record here is 2005-08-02 and the most recent 2005-08-02. 2 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 442 – overlay codes cover the same geography, so a rate center is served by all of them.

3 assigned blocks – 0.4% of 760
3 holders of record
2 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
760-366 Frontier FRONTIER CALIFORNIA INC. – no yes
760-821 Onvoy ONVOY, LLC - CA – yes yes
760-974 Lumen LEVEL 3 COMMUNICATIONS, LLC - CA 2005-08-02 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
FRONTIER CALIFORNIA INC. Frontier 1 33.3%
ONVOY, LLC - CA Onvoy 1 33.3%
LEVEL 3 COMMUNICATIONS, LLC - CA Lumen 1 33.3%

Frequently asked

Which prefixes belong to JOSHUATREE in area code 760?

3 blocks: 366, 821, 974. The table above gives the holder of each.

Which carriers have numbers in JOSHUATREE?

FRONTIER CALIFORNIA INC. (1 block), ONVOY, LLC - CA (1 block), LEVEL 3 COMMUNICATIONS, 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 JOSHUATREE 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 760

All 785 prefixes in 760