ウェブColumbus, Ohio. / 39.96222°N 83.00056°W / 39.96222; -83.00056. Columbus ( / kəˈlʌmbəs /, kə-LUM-bəs) is the capital and most populous city of the U.S. state of Ohio. With a 2020 census population of 905,748, [10] it is the 14th-most populous city in the U.S., the second-most populous city in the Midwest after Chicago, and the ...