Area Code Lookup
What Area Code Is Allentown?
Area code 640 · New Jersey
Allentown uses area code 640. It is located in New Jersey.
Area Code Serving Allentown
Frequently Asked Questions
What area code is Allentown?
Allentown uses area code 640. It is located in New Jersey.
How do I call Allentown from outside the US?
To call Allentown from abroad, dial +1 followed by the area code and 7-digit local number (e.g. +1-640-XXX-XXXX). The +1 is the country code for all NANPA countries.