Tulsa, Oklahoma is 65% larger than Atlanta.
Area: 346 km2 calculated
Atlanta is the capital of and the most populous city in the U.S. state of Georgia, with an estimated 2013 population of 447,841. Atlanta is the cultural and economic center of the Atlanta metropolitan area, home to 5,522,942 people and the ninth largest metropolitan area in the United States. Wikipedia
Area: 569 km2 calculated
Tulsa is the second-largest city in the U.S. state of Oklahoma and 46th-largest city in the United States. The population has grown since the 2010 census, With a population of 398,121 as of July 2013. Wikipedia