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

SAN JUAN prefixes in area code 360

NANPA records 9 assigned NXX blocks to rate center SAN JUAN in area code 360, 1.1% 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. 4 holders hold those blocks, the largest being CENTURYTEL OF INTER-ISLAND, INC. DBA CENTURYLINK (6), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA (1), NEW CINGULAR WIRELESS PCS, LLC (1). The earliest assignment on record here is 2001-02-15 and the most recent 2004-05-19. 8 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 831 – overlay codes cover the same geography, so a rate center is served by all of them.

9 assigned blocks – 1.1% of 360
4 holders of record
8 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
360-298 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA – yes yes
360-317 Lumen CENTURYTEL OF INTER-ISLAND, INC. DBA CENTURYLINK – yes yes
360-370 Lumen CENTURYTEL OF INTER-ISLAND, INC. DBA CENTURYLINK – yes yes
360-375 Lumen CENTURYTEL OF INTER-ISLAND, INC. DBA CENTURYLINK – yes yes
360-376 Lumen CENTURYTEL OF INTER-ISLAND, INC. DBA CENTURYLINK – yes yes
360-378 Lumen CENTURYTEL OF INTER-ISLAND, INC. DBA CENTURYLINK – no yes
360-468 Lumen CENTURYTEL OF INTER-ISLAND, INC. DBA CENTURYLINK – yes yes
360-472 AT&T NEW CINGULAR WIRELESS PCS, LLC 2001-02-15 yes yes
360-622 T-Mobile T-MOBILE USA, INC. 2004-05-19 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
CENTURYTEL OF INTER-ISLAND, INC. DBA CENTURYLINK Lumen 6 66.7%
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA Verizon 1 11.1%
NEW CINGULAR WIRELESS PCS, LLC AT&T 1 11.1%
T-MOBILE USA, INC. T-Mobile 1 11.1%

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 SAN JUAN in area code 360?

9 blocks: 298, 317, 370, 375, 376, 378, 468, 472, 622. The table above gives the holder of each.

Which carriers have numbers in SAN JUAN?

CENTURYTEL OF INTER-ISLAND, INC. DBA CENTURYLINK (6 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA (1 block), NEW CINGULAR WIRELESS PCS, LLC (1 block), T-MOBILE USA, INC. (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is SAN JUAN 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 360

All 786 prefixes in 360