Prefix Information
The prefix 340 is part of area code 405 serving Oklahoma City, Oklahoma.
This exchange contains 10,000 possible phone numbers (405-340-0000 through 405-340-9999).
Phone numbers with prefix 340 in area code 405. Location: Oklahoma City, Oklahoma.
The prefix 340 is part of area code 405 serving Oklahoma City, Oklahoma.
This exchange contains 10,000 possible phone numbers (405-340-0000 through 405-340-9999).