Harrison is a city in and the county seat of Boone County, Arkansas, United States. It is named after Marcus LaRue Harrison, a surveyor who laid out the city along Crooked Creek at Stifler Springs. As of the 2020 census, Harrison had a population of 13,069. It is the 30th largest city in Arkansas, based on official 2019 estimates from the U.S. Census Bureau. Harrison is the principal city of the Harrison Micropolitan Statistical Area, which includes all of Boone and Newton counties.