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

LONGMONT prefixes in area code 303

NANPA records 18 assigned NXX blocks to rate center LONGMONT in area code 303, 2.3% of the 784 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 QWEST CORPORATION (10), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO (4), LEVEL 3 COMMUNICATIONS, LLC - CO (2). The earliest assignment on record here is 2006-09-27 and the most recent 2006-09-27. 8 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 720, 983 – overlay codes cover the same geography, so a rate center is served by all of them.

18 assigned blocks – 2.3% of 303
5 holders of record
8 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
303-485 Lumen QWEST CORPORATION – no yes
303-532 Windstream PAETEC ITEL, LLC – yes yes
303-651 Lumen QWEST CORPORATION – no yes
303-652 Lumen QWEST CORPORATION – yes yes
303-678 Lumen QWEST CORPORATION – no yes
303-682 Lumen QWEST CORPORATION – no yes
303-684 Lumen QWEST CORPORATION – no yes
303-702 Lumen QWEST CORPORATION – no yes
303-709 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO – yes yes
303-746 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO – yes yes
303-772 Lumen QWEST CORPORATION – no yes
303-774 Lumen QWEST CORPORATION – no yes
303-775 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO – no yes
303-776 Lumen QWEST CORPORATION – no yes
303-827 Lumen LEVEL 3 COMMUNICATIONS, LLC - CO – yes yes
303-834 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 2006-09-27 yes yes
303-845 AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CO – yes yes
303-848 Lumen LEVEL 3 COMMUNICATIONS, LLC - CO – 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 10 55.6%
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO Verizon 4 22.2%
LEVEL 3 COMMUNICATIONS, LLC - CO Lumen 2 11.1%
PAETEC ITEL, LLC Windstream 1 5.6%
TELEPORT COMMUNICATIONS AMERICA, LLC - CO AT&T 1 5.6%

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 LONGMONT in area code 303?

18 blocks: 485, 532, 651, 652, 678, 682, 684, 702, 709, 746, 772, 774 and 6 more, all listed in the table above.

Which carriers have numbers in LONGMONT?

QWEST CORPORATION (10 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO (4 blocks), LEVEL 3 COMMUNICATIONS, LLC - CO (2 blocks), PAETEC ITEL, LLC (1 block), TELEPORT COMMUNICATIONS AMERICA, LLC - CO (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is LONGMONT 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 303

All 784 prefixes in 303