Prefix Information
The prefix 399 is part of area code 610 serving Allentown, Pennsylvania.
This exchange contains 10,000 possible phone numbers (610-399-0000 through 610-399-9999).
Phone numbers with prefix 399 in area code 610. Location: Allentown, Pennsylvania.
The prefix 399 is part of area code 610 serving Allentown, Pennsylvania.
This exchange contains 10,000 possible phone numbers (610-399-0000 through 610-399-9999).