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

SUBLETTE prefixes in area code 620

NANPA records 4 assigned NXX blocks to rate center SUBLETTE in area code 620, 0.6% of the 705 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 SOUTHWESTERN BELL (2), UNITED WIRELESS COMMUNICATIONS, INC. (1), TON80 COMMUNICATIONS, LLC (1). The earliest assignment on record here is 2001-06-08 and the most recent 2022-03-16. 3 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 815 – overlay codes cover the same geography, so a rate center is served by all of them.

4 assigned blocks – 0.6% of 620
3 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
620-510 AT&T SOUTHWESTERN BELL 2001-06-08 yes yes
620-675 AT&T SOUTHWESTERN BELL – yes yes
620-861 UNITED WIRELESS COMMUNICATIONS, INC. – no yes
620-929 TON80 COMMUNICATIONS, LLC 2022-03-16 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
SOUTHWESTERN BELL AT&T 2 50%
UNITED WIRELESS COMMUNICATIONS, INC. – 1 25%
TON80 COMMUNICATIONS, LLC – 1 25%

Frequently asked

Which prefixes belong to SUBLETTE in area code 620?

4 blocks: 510, 675, 861, 929. The table above gives the holder of each.

Which carriers have numbers in SUBLETTE?

SOUTHWESTERN BELL (2 blocks), UNITED WIRELESS COMMUNICATIONS, INC. (1 block), TON80 COMMUNICATIONS, LLC (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is SUBLETTE 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 620

All 705 prefixes in 620