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

MONTELLO prefixes in area code 608

NANPA records 3 assigned NXX blocks to rate center MONTELLO in area code 608, 0.4% 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. 2 holders hold those blocks, the largest being NEW CINGULAR WIRELESS PCS, LLC - IL (2), FRONTIER NORTH INC. - WI (1). The earliest assignment on record here is 2014-06-11 and the most recent 2014-06-11. 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 codes 353, 775 – overlay codes cover the same geography, so a rate center is served by all of them.

3 assigned blocks – 0.4% of 608
2 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
608-297 Frontier FRONTIER NORTH INC. - WI – yes yes
608-494 AT&T NEW CINGULAR WIRELESS PCS, LLC - IL – yes yes
608-818 AT&T NEW CINGULAR WIRELESS PCS, LLC - IL 2014-06-11 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
NEW CINGULAR WIRELESS PCS, LLC - IL AT&T 2 66.7%
FRONTIER NORTH INC. - WI Frontier 1 33.3%

Frequently asked

Which prefixes belong to MONTELLO in area code 608?

3 blocks: 297, 494, 818. The table above gives the holder of each.

Which carriers have numbers in MONTELLO?

NEW CINGULAR WIRELESS PCS, LLC - IL (2 blocks), FRONTIER NORTH INC. - WI (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is MONTELLO 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