What is what area code is 737?

The area code 737 is an overlay for the 512 area code in Texas, USA. It was added as a relief for the 512 area code to ensure a continuing supply of phone numbers. The 737 area code was officially put into effect on July 1, 2013. This means that new phone numbers in the Austin area may be assigned the 737 area code instead of 512. Callers within the 737 area code must dial the full 10-digit phone number, including the area code, for all local calls.