Prefix Information
The prefix 340 is part of area code 972 serving Dallas, Texas.
This exchange contains 10,000 possible phone numbers (972-340-0000 through 972-340-9999).
Phone numbers with prefix 340 in area code 972. Location: Dallas, Texas.
The prefix 340 is part of area code 972 serving Dallas, Texas.
This exchange contains 10,000 possible phone numbers (972-340-0000 through 972-340-9999).