Prefix overview
Phone numbers in prefix 815-203
This page covers the 815-203 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
815-203
RATE CENTER
JOLIET
CARRIER
SPOK, INC.
IL
Prefix range
The prefix 815-203 includes numbers from 8152030000 to 8152039999.
This range is associated with the JOLIET rate center and was originally assigned to SPOK, INC..
Numbers in this prefix
20 numbers