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

COLUMBUS prefixes in area code 406

NANPA records 6 assigned NXX blocks to rate center COLUMBUS in area code 406, 0.8% 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. 5 holders hold those blocks, the largest being CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT (2), ONVOY, LLC - MT (1), NEW CINGULAR WIRELESS PCS, LLC (1). The earliest assignment on record here is 2007-03-14 and the most recent 2021-05-24. 6 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 217, 270, 274, 364 – overlay codes cover the same geography, so a rate center is served by all of them.

6 assigned blocks – 0.8% of 406
5 holders of record
6 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
406-290 Onvoy ONVOY, LLC - MT 2007-03-14 yes yes
406-298 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT – yes yes
406-321 AT&T NEW CINGULAR WIRELESS PCS, LLC – yes yes
406-322 Lumen QWEST CORPORATION – yes yes
406-703 Telnyx TELNYX LLC 2021-05-24 yes yes
406-780 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT – 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 33.3%
ONVOY, LLC - MT Onvoy 1 16.7%
NEW CINGULAR WIRELESS PCS, LLC AT&T 1 16.7%
QWEST CORPORATION Lumen 1 16.7%
TELNYX LLC Telnyx 1 16.7%

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 COLUMBUS in area code 406?

6 blocks: 290, 298, 321, 322, 703, 780. The table above gives the holder of each.

Which carriers have numbers in COLUMBUS?

CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT (2 blocks), ONVOY, LLC - MT (1 block), NEW CINGULAR WIRELESS PCS, LLC (1 block), QWEST CORPORATION (1 block), TELNYX 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 COLUMBUS 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