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

TWISP prefixes in area code 509

NANPA records 3 assigned NXX blocks to rate center TWISP in area code 509, 0.4% of the 763 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. 2 holders hold those blocks, the largest being CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK (2), NEW CINGULAR WIRELESS PCS, LLC (1). 3 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

3 assigned blocks – 0.4% of 509
2 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
509-341 AT&T NEW CINGULAR WIRELESS PCS, LLC – yes yes
509-996 Lumen CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK – yes yes
509-997 Lumen CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK – 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 WASHINGTON, INC. DBA CENTURYLINK Lumen 2 66.7%
NEW CINGULAR WIRELESS PCS, LLC AT&T 1 33.3%

Frequently asked

Which prefixes belong to TWISP in area code 509?

3 blocks: 341, 996, 997. The table above gives the holder of each.

Which carriers have numbers in TWISP?

CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK (2 blocks), NEW CINGULAR WIRELESS PCS, LLC (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is TWISP 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 509

All 763 prefixes in 509