Prefix Information
The prefix 640 is part of area code 972 serving Dallas, Texas.
This exchange contains 10,000 possible phone numbers (972-640-0000 through 972-640-9999).
Phone numbers with prefix 640 in area code 972. Location: Dallas, Texas.
The prefix 640 is part of area code 972 serving Dallas, Texas.
This exchange contains 10,000 possible phone numbers (972-640-0000 through 972-640-9999).