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

SMITHTON prefixes in area code 660

NANPA records 4 assigned NXX blocks to rate center SMITHTON in area code 660, 0.8% of the 518 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 LEVEL 3 COMMUNICATIONS, LLC - MO (2), ONVOY, LLC - MO (1), EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO (1). The earliest assignment on record here is 2003-11-04 and the most recent 2004-12-30. 4 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

4 assigned blocks – 0.8% of 660
3 holders of record
4 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
660-204 Lumen LEVEL 3 COMMUNICATIONS, LLC - MO 2003-11-04 yes yes
660-290 Onvoy ONVOY, LLC - MO – yes yes
660-343 Lumen EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO – yes yes
660-431 Lumen LEVEL 3 COMMUNICATIONS, LLC - MO 2004-12-30 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
LEVEL 3 COMMUNICATIONS, LLC - MO Lumen 2 50%
ONVOY, LLC - MO Onvoy 1 25%
EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO Lumen 1 25%

Frequently asked

Which prefixes belong to SMITHTON in area code 660?

4 blocks: 204, 290, 343, 431. The table above gives the holder of each.

Which carriers have numbers in SMITHTON?

LEVEL 3 COMMUNICATIONS, LLC - MO (2 blocks), ONVOY, LLC - MO (1 block), EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is SMITHTON 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 660

All 518 prefixes in 660