Prefix Information
The prefix 423 is part of area code 610 serving Allentown, Pennsylvania.
This exchange contains 10,000 possible phone numbers (610-423-0000 through 610-423-9999).
Phone numbers with prefix 423 in area code 610. Location: Allentown, Pennsylvania.
The prefix 423 is part of area code 610 serving Allentown, Pennsylvania.
This exchange contains 10,000 possible phone numbers (610-423-0000 through 610-423-9999).