Prefix Information
The prefix 340 is part of area code 618 serving Belleville, Illinois.
This exchange contains 10,000 possible phone numbers (618-340-0000 through 618-340-9999).
Phone numbers with prefix 340 in area code 618. Location: Belleville, Illinois.
The prefix 340 is part of area code 618 serving Belleville, Illinois.
This exchange contains 10,000 possible phone numbers (618-340-0000 through 618-340-9999).