Some of the cities, towns, and places in Sebastian County are Barling, Bonanza, Central City, Fort Smith, Greenwood, Hackett, Hartford, Huntington, Lavaca, Mansfield, Midland

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.