Prefix Information
The prefix 840 is part of area code 405 serving Oklahoma City, Oklahoma.
This exchange contains 10,000 possible phone numbers (405-840-0000 through 405-840-9999).
Phone numbers with prefix 840 in area code 405. Location: Oklahoma City, Oklahoma.
The prefix 840 is part of area code 405 serving Oklahoma City, Oklahoma.
This exchange contains 10,000 possible phone numbers (405-840-0000 through 405-840-9999).