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

MONONA prefixes in area code 563

NANPA records 3 assigned NXX blocks to rate center MONONA in area code 563, 0.8% of the 388 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 NEW CINGULAR WIRELESS PCS, LLC - IL (1), T-MOBILE USA, INC. (1), NORTHEAST IOWA TEL. CO. (1). The earliest assignment on record here is 2006-11-16 and the most recent 2021-07-22. 1 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

3 assigned blocks – 0.8% of 563
3 holders of record
1 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
563-330 AT&T NEW CINGULAR WIRELESS PCS, LLC - IL 2021-07-22 yes yes
563-537 T-Mobile T-MOBILE USA, INC. 2006-11-16 no yes
563-539 NORTHEAST IOWA TEL. CO. – 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
NEW CINGULAR WIRELESS PCS, LLC - IL AT&T 1 33.3%
T-MOBILE USA, INC. T-Mobile 1 33.3%
NORTHEAST IOWA TEL. CO. – 1 33.3%

Frequently asked

Which prefixes belong to MONONA in area code 563?

3 blocks: 330, 537, 539. The table above gives the holder of each.

Which carriers have numbers in MONONA?

NEW CINGULAR WIRELESS PCS, LLC - IL (1 block), T-MOBILE USA, INC. (1 block), NORTHEAST IOWA TEL. CO. (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is MONONA 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 563

All 388 prefixes in 563