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

HOWELL prefixes in area code 435

NANPA records 3 assigned NXX blocks to rate center HOWELL in area code 435, 0.6% of the 501 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 ONVOY, LLC - UT (1), CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT (1), NORTH COUNTY COMMUNICATIONS CORPORATION - UT (1). The earliest assignment on record here is 2018-10-19 and the most recent 2018-10-19. 1 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 code 517 – overlay codes cover the same geography, so a rate center is served by all of them.

3 assigned blocks – 0.6% of 435
3 holders of record
1 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
435-422 Onvoy ONVOY, LLC - UT 2018-10-19 yes yes
435-471 Frontier CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT – no yes
435-473 NORTH COUNTY COMMUNICATIONS CORPORATION - UT – no 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
ONVOY, LLC - UT Onvoy 1 33.3%
CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT Frontier 1 33.3%
NORTH COUNTY COMMUNICATIONS CORPORATION - UT – 1 33.3%

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 HOWELL in area code 435?

3 blocks: 422, 471, 473. The table above gives the holder of each.

Which carriers have numbers in HOWELL?

ONVOY, LLC - UT (1 block), CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT (1 block), NORTH COUNTY COMMUNICATIONS CORPORATION - UT (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is HOWELL 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 435

All 501 prefixes in 435