Columbus is the capital of and the largest city in the U.S. state of Ohio. The Columbus metropolitan statistical area (MSA), which encompasses several counties, is the third largest in Ohio, after the Cleveland MSA and the Cincinnati MSA (which includes portions of Kentucky and Indiana). Columbus is the fifteenth largest city in the United States of America. It is the county seat of Franklin County, yet the city has expanded and annexed portions of adjoining Delaware County and Fairfield County. Named for explorer Christopher Columbus, the city was founded in 1812 at the confluence of the Scioto and Olentangy rivers, and assumed the functions of state capital in 1816.
The population of the city was 787,033 at the 2010 census, making it the most populous city in Ohio. Although Columbus was the 15th largest city in the United States, its metropolitan area was 28th largest, with 2,308,509 residents. It is the fourth most populous state capital in the United States. According to the U.S. Census Bureau, the Columbus Combined Statistical Area (which also includes Marion and Chillicothe) has a population of 2,348,495.