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

HORICON prefixes in area code 920

NANPA records 5 assigned NXX blocks to rate center HORICON in area code 920, 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. 5 holders hold those blocks, the largest being WISCONSIN BELL INC (1), ONVOY, LLC - WI (1), TELEPORT COMMUNICATIONS AMERICA, LLC WI (1). The earliest assignment on record here is 2002-04-15 and the most recent 2023-08-17. 5 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

5 assigned blocks – 0.6% of 920
5 holders of record
5 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
920-485 AT&T WISCONSIN BELL INC – yes yes
920-537 Onvoy ONVOY, LLC - WI 2021-07-14 yes yes
920-643 AT&T TELEPORT COMMUNICATIONS AMERICA, LLC WI 2002-04-15 yes yes
920-786 T-Mobile T-MOBILE USA, INC. – yes yes
920-908 COMMIO, LLC 2023-08-17 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
WISCONSIN BELL INC AT&T 1 20%
ONVOY, LLC - WI Onvoy 1 20%
TELEPORT COMMUNICATIONS AMERICA, LLC WI AT&T 1 20%
T-MOBILE USA, INC. T-Mobile 1 20%
COMMIO, LLC – 1 20%

Frequently asked

Which prefixes belong to HORICON in area code 920?

5 blocks: 485, 537, 643, 786, 908. The table above gives the holder of each.

Which carriers have numbers in HORICON?

WISCONSIN BELL INC (1 block), ONVOY, LLC - WI (1 block), TELEPORT COMMUNICATIONS AMERICA, LLC WI (1 block), T-MOBILE USA, INC. (1 block), COMMIO, 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 HORICON 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 920

All 785 prefixes in 920