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

WASHINGTON prefixes in area code 337

NANPA records 3 assigned NXX blocks to rate center WASHINGTON in area code 337, 0.5% of the 599 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 CHARTER IP ENABLED SERVICES, LLC (1), TON80 COMMUNICATIONS, LLC (1), BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL (1). The earliest assignment on record here is 2006-10-23 and the most recent 2022-02-24. 3 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 207, 252, 309, 319 – overlay codes cover the same geography, so a rate center is served by all of them.

3 assigned blocks – 0.5% of 337
3 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
337-628 Charter CHARTER IP ENABLED SERVICES, LLC 2006-10-23 yes yes
337-748 TON80 COMMUNICATIONS, LLC 2022-02-24 yes yes
337-826 AT&T BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL – 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
CHARTER IP ENABLED SERVICES, LLC Charter 1 33.3%
TON80 COMMUNICATIONS, LLC – 1 33.3%
BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL AT&T 1 33.3%

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 WASHINGTON in area code 337?

3 blocks: 628, 748, 826. The table above gives the holder of each.

Which carriers have numbers in WASHINGTON?

CHARTER IP ENABLED SERVICES, LLC (1 block), TON80 COMMUNICATIONS, LLC (1 block), BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is WASHINGTON 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 337

All 599 prefixes in 337