Hiwasse was an unincorporated census-designated place in Benton County, Arkansas, United States. As of the 2010 census, its population was 497. It is the location of Hiwasse Bank Building, which is …Hiwasse was an unincorporated census-designated place in Benton County, Arkansas, United States. As of the 2010 census, its population was 497. It is the location of Hiwasse Bank Building, which is located at Main St., AR 279 and Banks House, which is located on AR 72 west of Hiwasse. Both are listed on the National Register of Historic Places.