Burleigh County is a county in the U.S. state of North Dakota. As of the 2020 census, the population was 98,458, making it the second most populous county in North Dakota. Its county seat is Bismarck, the state capital. The county was named for Dakota Territory political figure Walter A. Burleigh.

Bismarck is the capital of the U.S. state of North Dakota and the county seat of Burleigh County. It is the state's 2nd most populous city, after Fargo. The population was 73,622 at the 2020 census, and was estimated to be 74,445 in 2022, while its metropolitan population was 133,626. In 2020, Forbes magazine ranked Bismarck as the seventh fastest-growing small city in the United States.