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

WEST SALEM prefixes in area code 608

NANPA records 5 assigned NXX blocks to rate center WEST SALEM in area code 608, 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), CHARTER IP ENABLED SERVICES, LLC (1), ONVOY, LLC - WI (1). The earliest assignment on record here is 2005-12-02 and the most recent 2021-04-24. 4 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 419, 567, 618 – overlay codes cover the same geography, so a rate center is served by all of them.

5 assigned blocks – 0.6% of 608
4 holders of record
4 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
608-351 T-Mobile T-MOBILE USA, INC. 2008-01-29 yes yes
608-612 Charter CHARTER IP ENABLED SERVICES, LLC 2005-12-02 yes yes
608-704 T-Mobile T-MOBILE USA, INC. 2021-04-24 yes yes
608-731 Onvoy ONVOY, LLC - WI 2017-03-06 yes yes
608-786 Brightspeed BRIGHTSPEED OF WISCONSIN, 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
T-MOBILE USA, INC. T-Mobile 2 40%
CHARTER IP ENABLED SERVICES, LLC Charter 1 20%
ONVOY, LLC - WI Onvoy 1 20%
BRIGHTSPEED OF WISCONSIN, LLC Brightspeed 1 20%

Frequently asked

Which prefixes belong to WEST SALEM in area code 608?

5 blocks: 351, 612, 704, 731, 786. The table above gives the holder of each.

Which carriers have numbers in WEST SALEM?

T-MOBILE USA, INC. (2 blocks), CHARTER IP ENABLED SERVICES, LLC (1 block), ONVOY, LLC - WI (1 block), BRIGHTSPEED OF WISCONSIN, 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 WEST SALEM 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 608

All 785 prefixes in 608