What is what area code is 539?

Area code 539 is an overlay code for the state of Oklahoma in the United States. It was established on April 1, 2011, as an overlay to provide additional numbering options for the 918 area code. The 539 area code covers cities such as Tulsa, Broken Arrow, Muskogee, and Bartlesville. Calls within the 539 area code must be dialed with the full 10-digit phone number, including the area code.