Boone County is a county in the U.S. state of Iowa. As of the 2020 census, the population was 26,715. Its county seat is Boone.
Boone County comprises the Boone, IA Micropolitan Statistical Area, which is included in the Des Moines-Ames-West Des Moines, IA Combined Statistical Area.
History
The land that now forms Boone and several other Iowa counties was ceded by the Sac and Fox nation to the United States in a treaty signed on October 11, 1842.
On January 13, 1846, the legislative body of the Indiana Territory authorized creation of twelve counties in the Iowa Territory, with general descriptions of their boundaries. Boone County's name referred to Captain Nathan Boone, son of Daniel Boone, an American pioneer who formed the Wilderness Trail and founded the settlement of Boonesborough, Kentucky.
County residents selected Boonesboro as the county seat in 1851. The first building erected in the new settlement was a double log house, to be used as interim county office and courthouse. It was supplemented by a two–story building erected in 1856, then replaced by a three-story building in 1868.
The nearby settlement of Montana was incorporated in 1866, when a railway station was built there. It was renamed to Boone in 1871. It continued to grow, and it annexed the settlement of Boonesboro (which had also been incorporated in 1866) in 1887, thus becoming the county seat.
After the second courthouse became too small for the county's expanding populace, a new building (the present courthouse) replaced it. It was completed in 1917.
Geography
According to the U.S. Census Bureau, the county has a total area of , of which is land and (0.4%) is water.
Major highways
U.S. Highway 30 – runs east–west through center of county. Passes Beaver, Ogden, and Jordan. U.S. Highway 169 – runs south from Webster County through the west-central portion of Boone County. At its intersection with US 30, U.S. 169 runs east three miles to Ogden, then runs south to Dallas County. Iowa Highway 17 – runs south through eastern Boone County to Jordan, west one mile, then south to the boundary line between Dallas and Polk counties. Iowa Highway 144 – runs across the southwest tip of the county from northwest to southeast. Iowa Highway 210 – enters south line of county at Woodward, then runs east and east-northeast across the southern portion of county to Story County.
Adjacent counties
Dallas County – south
Greene County – west
Hamilton County – north and northeast
Polk County – south and southeast
Story County – east
Webster County – north and northwest
Demographics
2020 census
The 2020 census recorded a population of 26,715 in the county, with a population density of . 96.05% of the population reported being of one race. 90.71% were non-Hispanic White, 1.13% were Black, 2.65% were Hispanic, 0.24% were Native American, 0.37% were Asian, 0.01% were Native Hawaiian or Pacific Islander and 4.88% were some other race or more than one race. There were 11,921 housing units of which 10,981 were occupied.
2010 census
The 2010 census recorded a population of 26,306 in the county, with a population density of . There were 11,756 housing units, of which 10,728 were occupied.
2000 census
As of the census of 2000, there were 26,224 people, 10,374 households, and 7,137 families residing in the county. The population density was . There were 10,968 housing units at an average density of . The racial makeup of the county was 98.53% White, 0.36% Black or African American, 0.20% Native American, 0.22% Asian, 0.26% from other races, and 0.43% from two or more races. 0.83% of the population were Hispanic or Latino of any race.
There were 10,374 households, out of which 31.20% had children under the age of 18 living with them, 58.00% were married couples living together, 7.80% had a female householder with no husband present, and 31.20% were non-families. 26.70% of all households were made up of individuals, and 11.80% had someone living alone who was 65 years of age or older. The average household size was 2.44 and the average family size was 2.95.
In the county, the population was spread out, with 24.80% under the age of 18, 8.40% from 18 to 24, 27.10% from 25 to 44, 23.30% from 45 to 64, and 16.40% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 95.90 males. For every 100 females age 18 and over, there were 91.70 males.