Burleigh County, North Dakota were below the poverty line, including 11.6% of those under age 18 and 11.0% of those age 65 or over. Burleigh County, North Dakota Burleigh County is a county located in the U.S. state of North Dakota. As of the 2010 census, the population was 81,308, making it the second-most populous county in North Dakota. Its county seat is Bismarck, the state capital. The county was created on January 4, 1873 and later organized on July 16. Burleigh County is included in the Bismarck, ND Metropolitan Statistical Area, commonly called "Bismarck–Mandan". According to the U.S. Census Bureau, the county has
U.S. Route 12 in North Dakota run concurrently for a short distance through the city. U.S. Route 12 in North Dakota U.S. Route 12 (US 12) is a part of the U.S. Highway System that travels from Aberdeen, Washington, to Detroit, Michigan. In the state of North Dakota, US 12 extends from the Montana border east to the South Dakota border. Throughout the state, US 12 is a two-lane undivided highway that runs through Adams, Bowman and Slope counties in southwest North Dakota. The speed limit is on rural segments, with slower posted speeds within the cities of Marmarth, Rhame, Bowman, Scranton and Hettinger. US 12