Harrison is a city in Boone County, Arkansas, United States. It is the county seat. It named after General Marcus LaRue Harrison, a surveyor that laid out the city along Crooked Creek at Stifler Springs. According to 2012 Census Bureau estimates, the population of the city was 13,163, up from 12,943 at the 2010 census.Harrison is the principal city of the Harrison Micropolitan Statistical Area, which includes all of Boone and Newton counties.