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

RIDGEFIELD prefixes in area code 360

NANPA records 5 assigned NXX blocks to rate center RIDGEFIELD in area code 360, 0.6% 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. 5 holders hold those blocks, the largest being COMCAST IP PHONE, LLC (1), TELEPORT COMMUNICATIONS AMERICA, LLC - WA (1), ONVOY, LLC - WA (1). The earliest assignment on record here is 2017-02-03 and the most recent 2021-10-22. 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 codes 203, 475 – overlay codes cover the same geography, so a rate center is served by all of them.

5 assigned blocks – 0.6% of 360
5 holders of record
5 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
360-309 Comcast COMCAST IP PHONE, LLC 2017-02-03 yes yes
360-727 AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - WA – yes yes
360-803 Onvoy ONVOY, LLC - WA 2021-10-22 yes yes
360-857 Lumen LEVEL 3 COMMUNICATIONS, LLC - WA – yes yes
360-887 Lumen QWEST CORPORATION – 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
COMCAST IP PHONE, LLC Comcast 1 20%
TELEPORT COMMUNICATIONS AMERICA, LLC - WA AT&T 1 20%
ONVOY, LLC - WA Onvoy 1 20%
LEVEL 3 COMMUNICATIONS, LLC - WA Lumen 1 20%
QWEST CORPORATION Lumen 1 20%

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 RIDGEFIELD in area code 360?

5 blocks: 309, 727, 803, 857, 887. The table above gives the holder of each.

Which carriers have numbers in RIDGEFIELD?

COMCAST IP PHONE, LLC (1 block), TELEPORT COMMUNICATIONS AMERICA, LLC - WA (1 block), ONVOY, LLC - WA (1 block), LEVEL 3 COMMUNICATIONS, LLC - WA (1 block), QWEST CORPORATION (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is RIDGEFIELD 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