East Baton Rouge Parish, Louisiana is 3.5 times 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: 1,215 km2 calculated
East Baton Rouge Parish is a parish located in the U.S. state of Louisiana. As of the 2010 census, the population was 440,171, making it the most populous parish in the state. The parish seat is Baton Rouge, Louisiana's state capital. Wikipedia