Fort Smith is the second-largest city in Arkansas and one of the two county seats of Sebastian County. As of the 2010 Census the population was 86,209. With an estimated population of 87,443 in 2012, it is the principal city of the Fort Smith, Arkansas-Oklahoma Metropolitan Statistical Area, a region of 298,592 residents which encompasses the Arkansas counties of Crawford, Franklin, and Sebastian, and the Oklahoma counties Le Flore and Sequoyah.