Prefix overview
Phone numbers in prefix 331-204
This page covers the 331-204 prefix in the United States. It shows where numbers come from, which carrier is linked to the range, and how this block is structured.
If you are looking for a specific number, you can continue to its dedicated phone page. Otherwise, this page helps you understand the broader number block behind it.
PREFIX
331-204
RATE CENTER
NAPERVILLE
CARRIER
ONVOY, LLC
IL
Prefix range
The prefix 331-204 includes numbers from 3312040000 to 3312049999.
This range is associated with the NAPERVILLE rate center and was originally assigned to ONVOY, LLC.
Numbers in this prefix
20 numbers