Prefix Information
The prefix 603 is part of area code 618 serving Belleville, Illinois.
This exchange contains 10,000 possible phone numbers (618-603-0000 through 618-603-9999).
Phone numbers with prefix 603 in area code 618. Location: Belleville, Illinois.
The prefix 603 is part of area code 618 serving Belleville, Illinois.
This exchange contains 10,000 possible phone numbers (618-603-0000 through 618-603-9999).