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

WYELLOWSTN prefixes in area code 406

NANPA records 3 assigned NXX blocks to rate center WYELLOWSTN in area code 406, 0.4% of the 754 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 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT (2), QWEST CORPORATION (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 406
2 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
406-640 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT – yes yes
406-641 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT – yes yes
406-646 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
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT Verizon 2 66.7%
QWEST CORPORATION Lumen 1 33.3%

Frequently asked

Which prefixes belong to WYELLOWSTN in area code 406?

3 blocks: 640, 641, 646. The table above gives the holder of each.

Which carriers have numbers in WYELLOWSTN?

CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT (2 blocks), 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 WYELLOWSTN 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 406

All 754 prefixes in 406