East Baton Rouge Parish, Louisiana is 3.3 times larger than Philadelphia.
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
Area: 370 km2 calculated
Philadelphia is the largest city in the Commonwealth of Pennsylvania, the fifth-most-populous city in the United States, and the core of the sixth-largest metropolitan area in the country. Wikipedia