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

MILES CITY prefixes in area code 406

NANPA records 10 assigned NXX blocks to rate center MILES CITY in area code 406, 1.3% 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. 6 holders hold those blocks, the largest being QWEST CORPORATION (2), MID-RIVERS TELEPHONE COOPERATIVE, INC. (2), NEW CINGULAR WIRELESS PCS, LLC (2). The earliest assignment on record here is 2003-01-09 and the most recent 2003-01-09. 8 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

10 assigned blocks – 1.3% of 406
6 holders of record
8 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
406-232 Lumen QWEST CORPORATION – no yes
406-233 Lumen QWEST CORPORATION – yes yes
406-234 MID-RIVERS TELEPHONE COOPERATIVE, INC. – no yes
406-851 AT&T NEW CINGULAR WIRELESS PCS, LLC – yes yes
406-852 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT – yes yes
406-853 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT – yes yes
406-874 MID-RIVERS TELEPHONE COOPERATIVE, INC. – yes yes
406-934 WIDE VOICE, LLC - MT – yes yes
406-944 Lumen LEVEL 3 COMMUNICATIONS, LLC - MT 2003-01-09 yes yes
406-951 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
QWEST CORPORATION Lumen 2 20%
MID-RIVERS TELEPHONE COOPERATIVE, INC. – 2 20%
NEW CINGULAR WIRELESS PCS, LLC AT&T 2 20%
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT Verizon 2 20%
WIDE VOICE, LLC - MT – 1 10%
LEVEL 3 COMMUNICATIONS, LLC - MT Lumen 1 10%

Frequently asked

Which prefixes belong to MILES CITY in area code 406?

10 blocks: 232, 233, 234, 851, 852, 853, 874, 934, 944, 951. The table above gives the holder of each.

Which carriers have numbers in MILES CITY?

QWEST CORPORATION (2 blocks), MID-RIVERS TELEPHONE COOPERATIVE, INC. (2 blocks), NEW CINGULAR WIRELESS PCS, LLC (2 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT (2 blocks), WIDE VOICE, LLC - MT (1 block), LEVEL 3 COMMUNICATIONS, LLC - MT (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is MILES CITY 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