East Baton Rouge Parish, Louisiana is 18 times larger than Boulder, Colorado.
Area: 68 km2 calculated
Boulder is the county seat and most populous city of Boulder County and the 11th most populous city in the U.S. state of Colorado. Boulder is located at the base of the foothills of the Rocky Mountains at an elevation of 5,430 feet. The city is 25 miles northwest of Denver. 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