Dublin is a city in the U.S. state of Ohio. A suburb of Columbus, it falls within the jurisdictions of the counties of Franklin County, Delaware County, and Union County. The population was 49,328 at the 2020 census. The city of Dublin hosts the yearly Memorial Tournament at the Muirfield Village Golf Club. The Dublin Irish Festival advertises itself as the largest three-day Irish festival in the world.

Columbus is the capital and most populous city of the U.S. state of Ohio. With a 2020 census population of 905,748, 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 U.S. state capital after Phoenix, Arizona and Austin, Texas. Columbus is the seat of government of Franklin County; it also extends into Delaware and Fairfield counties. It is the core city of the Columbus metropolitan area, which encompasses ten counties in central Ohio. It had a population of 2,138,926 in 2020, making it the largest metropolitan area entirely in Ohio and 32nd-largest metro area in the U.S.