From Wikipedia, the free encyclopedia. The Map to the right is now clickable; click on an area code to go to the map for that code. Area code 937 is a telephone area code serving much of the southwestern part of the U.S. state of Ohio and was established September 28, 1996.t covers Bellefontaine, Dayton, Fairborn, Hillsboro, Marysville, Springfield, Wilmington, Xenia, public parts of Wright-Patterson Air Force Base, and areas north and east of Cincinnati.