Columbus is the state capital and the most populous city in the U.S. state of Ohio. With a population estimated at 898,553 in 2019, it is the 14th-most populous city in the U.S., the second-most populous city in the Midwest after Chicago, and the third-most populous state capital. Columbus is the county seat of Franklin County; it also extends into Delaware and Fairfield counties. It is the core city of the Columbus, OH Metropolitan Statistical Area, which encompasses ten counties. With a 2019 estimated population of 2,122,271, it is the largest metropolitan area entirely in Ohio. The flag of Columbus is the official municipal flag of Columbus, Ohio. Its current design is a yellow, white, red vertical triband with the city seal on a blue field. Officially, the flag was adopted in 1929, although it is unknown if the flag was ever flown when it was first adopted. Full HD.