Prefix Information
The prefix 721 is part of area code 610 serving Allentown, Pennsylvania.
This exchange contains 10,000 possible phone numbers (610-721-0000 through 610-721-9999).
Phone numbers with prefix 721 in area code 610. Location: Allentown, Pennsylvania.
The prefix 721 is part of area code 610 serving Allentown, Pennsylvania.
This exchange contains 10,000 possible phone numbers (610-721-0000 through 610-721-9999).