Montgomery County, Iowa  Montgomery County is a county located in the southwestern area of the U.S. state of Iowa. As of the 2010 census, the population was 10,740. Its population has declined since a peak in 1900, since urbanization and decline of family farms. The county seat is Red Oak. The county was founded by European-American migrants from eastern areas in 1851. It was named in honor of Richard Montgomery, an American Revolutionary War general killed in 1775 while trying to capture Quebec City, Canada. The county has been largely rural and devoted to agriculture. The county was first surveyed in 1852. It is famous as the location of the unsolved Villisca Axe Murders committed in 1912. Clyde Cessna, the founder of the Cessna Aircraft Company, was born here. According to the U.S. Census Bureau, the county has a total area of , of which is land and (0.2%) is water. The 2010 census recorded a population of 10,740 in the county, with a population density of . There were 5,239 housing units, of which 4,558 were occupied. At the 2000 census there were 11,771 people, 4,886 households, and 3,258 families in the county. The population density was 28 people per square mile (11/km²). There were 5,399 housing units at an average density of 13 per square mile (5/km²). The racial makeup of the county was 98.20% White, 0.08% Black or African American, 0.35% Native American, 0.25% Asian, 0.01% Pacific Islander, 0.68% from other races, and 0.44% from two or more races. 1.30%. were Hispanic or Latino of any race. Of the 4,886 households 29.70% had children under the age of 18 living with them, 54.40% were married couples living together, 8.70% had a female householder with no husband present, and 33.30% were non-families. 29.50% of households were one person and 14.70% were one person aged 65 or older. The average household size was 2.36 and the average family size was 2.91. The age distribution was 25.00% under the age of 18, 6.50% from 18 to 24, 25.50% from 25 to 44, 22.80% from 45 to 64, and 20.30% 65 or older.