Under the Combined Statistical Area (CSA) model, the Columbus, OH Metropolitan Statistical Area was the 25th largest in the United States. According to the U.S. Census Bureau, the Columbus-Marion-Zanesville, OH Combined Statistical Area (which also includes Marion, Chillicothe, and Mount Vernon) has a population of 2,424,831, making it the second largest metropolitan area in Ohio behind Cleveland. It is also the fourth most populous state capital in the United States, and the third largest city in the Midwestern United States.