Prefix Information
The prefix 603 is part of area code 815 serving Rockford, Illinois.
This exchange contains 10,000 possible phone numbers (815-603-0000 through 815-603-9999).
Phone numbers with prefix 603 in area code 815. Location: Rockford, Illinois.
The prefix 603 is part of area code 815 serving Rockford, Illinois.
This exchange contains 10,000 possible phone numbers (815-603-0000 through 815-603-9999).