what county is sebastian
Sebastian County is a county located in the U.S. state of Arkansas. As of the 2010 census, the population was 125,744, making it the fourth-most populous county in Arkansas.The county has two county seats, Greenwood and Fort Smith. Sebastian County is part of the Fort Smith, AR-OK Metropolitan Statistical Area.ebastian County is Arkansas's 56th county, formed on January 6, 1851, and named for William K. Sebastian, United States Senator from Arkansas.