Prefix overview
Phone numbers in prefix 331-221
This page covers the 331-221 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
331-221
RATE CENTER
ELMHURST
CARRIER
ILLINOIS BELL TEL CO
IL
Prefix range
The prefix 331-221 includes numbers from 3312210000 to 3312219999.
This range is associated with the ELMHURST rate center and was originally assigned to ILLINOIS BELL TEL CO.
Numbers in this prefix
20 numbers