 As of July 2018's estimates by the United States Census Bureau, Harrison County had a population of 66,726.There were 28,726 households and 23,217 families residing in the county.The racial makeup of Harrison County was 63.2% non-Hispanic white, 21.1% Black or African American, 1.2% American Indian or Alaska Native, 0.8% Asian, 0.1% Pacific Islander, and 1.7% from two or more races.