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

RIVERTON prefixes in area code 307

NANPA records 13 assigned NXX blocks to rate center RIVERTON in area code 307, 2.6% of the 499 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 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY (3), UNION TELEPHONE COMPANY (3), QWEST CORPORATION (3). The earliest assignment on record here is 2002-06-11 and the most recent 2024-06-07. 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 217, 304, 447, 620 – overlay codes cover the same geography, so a rate center is served by all of them.

13 assigned blocks – 2.6% of 307
6 holders of record
8 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
307-240 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY – yes yes
307-454 Onvoy ONVOY, LLC - WY 2024-06-07 yes yes
307-463 Lumen LEVEL 3 COMMUNICATIONS, LLC - WY 2002-06-11 yes yes
307-556 Onvoy ONVOY, LLC - WY 2021-02-05 yes yes
307-709 UNION TELEPHONE COMPANY 2003-06-16 no yes
307-840 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY – yes yes
307-850 UNION TELEPHONE COMPANY – no yes
307-851 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY – no yes
307-854 ADVANCED COMMUNICATIONS TECHNOLOGY, INC. - WY 2007-12-10 yes yes
307-855 Lumen QWEST CORPORATION – yes yes
307-856 Lumen QWEST CORPORATION – no yes
307-857 Lumen QWEST CORPORATION – yes yes
307-858 UNION TELEPHONE COMPANY – 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
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY Verizon 3 23.1%
UNION TELEPHONE COMPANY – 3 23.1%
QWEST CORPORATION Lumen 3 23.1%
ONVOY, LLC - WY Onvoy 2 15.4%
LEVEL 3 COMMUNICATIONS, LLC - WY Lumen 1 7.7%
ADVANCED COMMUNICATIONS TECHNOLOGY, INC. - WY – 1 7.7%

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 RIVERTON in area code 307?

13 blocks: 240, 454, 463, 556, 709, 840, 850, 851, 854, 855, 856, 857 and 1 more, all listed in the table above.

Which carriers have numbers in RIVERTON?

CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY (3 blocks), UNION TELEPHONE COMPANY (3 blocks), QWEST CORPORATION (3 blocks), ONVOY, LLC - WY (2 blocks), LEVEL 3 COMMUNICATIONS, LLC - WY (1 block), ADVANCED COMMUNICATIONS TECHNOLOGY, INC. - WY (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is RIVERTON 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 307

All 499 prefixes in 307