Bismarck is the capital city of the U.S. state of North Dakota and the county seat of Burleigh County. It is the state's second-most populous city, after Fargo. The population was 73,622 at the 2020 census, and was estimated at 77,772 in 2024, while its metropolitan population was 133,626. In 2014, Forbes magazine ranked Bismarck as the seventh fastest-growing small city in the United States.