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

WALNUT GRV prefixes in area code 916

NANPA records 5 assigned NXX blocks to rate center WALNUT GRV in area code 916, 0.6% of the 785 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. 4 holders hold those blocks, the largest being T-MOBILE USA, INC. (2), NEW CINGULAR WIRELESS PCS, LLC (1), CENTURYLINK COMMUNICATIONS, LLC (1). The earliest assignment on record here is 2002-01-28 and the most recent 2002-01-28. 5 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 205, 279, 417, 507 – overlay codes cover the same geography, so a rate center is served by all of them.

5 assigned blocks – 0.6% of 916
4 holders of record
5 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
916-270 T-Mobile T-MOBILE USA, INC. – yes yes
916-398 AT&T NEW CINGULAR WIRELESS PCS, LLC – yes yes
916-477 T-Mobile T-MOBILE USA, INC. 2002-01-28 yes yes
916-527 Lumen CENTURYLINK COMMUNICATIONS, LLC – yes yes
916-776 Frontier CITIZENS TELECOM CA. DBA FRONTIER COM OF CA – 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
T-MOBILE USA, INC. T-Mobile 2 40%
NEW CINGULAR WIRELESS PCS, LLC AT&T 1 20%
CENTURYLINK COMMUNICATIONS, LLC Lumen 1 20%
CITIZENS TELECOM CA. DBA FRONTIER COM OF CA Frontier 1 20%

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 WALNUT GRV in area code 916?

5 blocks: 270, 398, 477, 527, 776. The table above gives the holder of each.

Which carriers have numbers in WALNUT GRV?

T-MOBILE USA, INC. (2 blocks), NEW CINGULAR WIRELESS PCS, LLC (1 block), CENTURYLINK COMMUNICATIONS, LLC (1 block), CITIZENS TELECOM CA. DBA FRONTIER COM OF CA (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is WALNUT GRV 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 916

All 785 prefixes in 916