Denison is a city in Crawford County, Iowa, United States, along the Boyer River, and located in both Denison Township and East Boyer Township. The population was 8,373 at the time of the 2020 census. It is the county seat of Crawford County.
History
Denison was laid out in 1856; the town was incorporated in 1875. Denison was named for its founder, J. W. Denison.
Geography
According to the United States Census Bureau, the city has a total area of , of which, is land and is water.
Climate
According to the Köppen Climate Classification system, Denison has a hot-summer humid continental climate, abbreviated "Dfa" on climate maps.