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

W GLENDIVE prefixes in area code 406

NANPA records 4 assigned NXX blocks to rate center W GLENDIVE in area code 406, 0.5% 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. 3 holders hold those blocks, the largest being CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT (2), MID-RIVERS TEL. COOP., INC. (1), NEW CINGULAR WIRELESS PCS, LLC (1). 4 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

4 assigned blocks – 0.5% of 406
3 holders of record
4 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
406-687 MID-RIVERS TEL. COOP., INC. – yes yes
406-939 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT – yes yes
406-941 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT – yes yes
406-989 AT&T NEW CINGULAR WIRELESS PCS, LLC – 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 50%
MID-RIVERS TEL. COOP., INC. – 1 25%
NEW CINGULAR WIRELESS PCS, LLC AT&T 1 25%

Frequently asked

Which prefixes belong to W GLENDIVE in area code 406?

4 blocks: 687, 939, 941, 989. The table above gives the holder of each.

Which carriers have numbers in W GLENDIVE?

CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT (2 blocks), MID-RIVERS TEL. COOP., INC. (1 block), 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 W GLENDIVE 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