Prefix Information
The prefix 311 is part of area code 405 serving Oklahoma City, Oklahoma.
This exchange contains 10,000 possible phone numbers (405-311-0000 through 405-311-9999).
Phone numbers with prefix 311 in area code 405. Location: Oklahoma City, Oklahoma.
The prefix 311 is part of area code 405 serving Oklahoma City, Oklahoma.
This exchange contains 10,000 possible phone numbers (405-311-0000 through 405-311-9999).