Prefix Information
The prefix 304 is part of area code 815 serving Rockford, Illinois.
This exchange contains 10,000 possible phone numbers (815-304-0000 through 815-304-9999).
Phone numbers with prefix 304 in area code 815. Location: Rockford, Illinois.
The prefix 304 is part of area code 815 serving Rockford, Illinois.
This exchange contains 10,000 possible phone numbers (815-304-0000 through 815-304-9999).