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

RICHFIELD prefixes in area code 435

NANPA records 10 assigned NXX blocks to rate center RICHFIELD in area code 435, 2.0% 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. 8 holders hold those blocks, the largest being NEW CINGULAR WIRELESS PCS, LLC (2), QWEST CORPORATION (2), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT (1). The earliest assignment on record here is 2001-04-27 and the most recent 2022-02-24. 9 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 208, 223, 234, 330 – overlay codes cover the same geography, so a rate center is served by all of them.

10 assigned blocks – 2% of 435
8 holders of record
9 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
435-201 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT – yes yes
435-287 CENTRAL TELCOM SVCS DBA CENTRACOM INTERACTIVE - NV 2008-03-18 yes yes
435-289 Peerless PEERLESS NETWORK OF UTAH, LLC - UT 2019-03-05 yes yes
435-304 AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - UT – yes yes
435-558 AT&T NEW CINGULAR WIRELESS PCS, LLC 2001-04-27 yes yes
435-567 TON80 COMMUNICATIONS, LLC 2022-02-24 yes yes
435-633 Lumen LEVEL 3 COMMUNICATIONS, LLC - UT 2002-04-24 yes yes
435-893 Lumen QWEST CORPORATION – yes yes
435-896 Lumen QWEST CORPORATION – yes yes
435-979 AT&T NEW CINGULAR WIRELESS PCS, LLC – 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
NEW CINGULAR WIRELESS PCS, LLC AT&T 2 20%
QWEST CORPORATION Lumen 2 20%
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT Verizon 1 10%
CENTRAL TELCOM SVCS DBA CENTRACOM INTERACTIVE - NV – 1 10%
PEERLESS NETWORK OF UTAH, LLC - UT Peerless 1 10%
TELEPORT COMMUNICATIONS AMERICA, LLC - UT AT&T 1 10%
TON80 COMMUNICATIONS, LLC – 1 10%
LEVEL 3 COMMUNICATIONS, LLC - UT Lumen 1 10%

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 RICHFIELD in area code 435?

10 blocks: 201, 287, 289, 304, 558, 567, 633, 893, 896, 979. The table above gives the holder of each.

Which carriers have numbers in RICHFIELD?

NEW CINGULAR WIRELESS PCS, LLC (2 blocks), QWEST CORPORATION (2 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT (1 block), CENTRAL TELCOM SVCS DBA CENTRACOM INTERACTIVE - NV (1 block), PEERLESS NETWORK OF UTAH, LLC - UT (1 block), TELEPORT COMMUNICATIONS AMERICA, LLC - 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 RICHFIELD 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