Allison is a city in, and the county seat of, Butler County, Iowa, United States. The population was 966 at the 2020 census. Allison is home to the Butler County Fair. The city was named for U.S. Senator William B. Allison in 1881. Geography Allison's longitude and latitude coordinates in decimal form are 42.753466, -92.794599. According to the United States Census Bureau, the city has a total area of , all land. Demographics 2010 census As of the census of 2010, there were 1,029 people, 440 households, and 277 families living in the city. The population density was . There were 470 housing units at an average density of . The racial makeup of the city was 99.4% White, 0.1% Asian, and 0.5% from two or more races. Hispanic or Latino people of any race were 0.2% of the population. There were 440 households, of which 25.9% had children under the age of 18 living with them, 53.4% were married couples living together, 6.4% had a female householder with no husband present, 3.2% had a male householder with no wife present, and 37.0% were non-families. 32.3% of all households were made up of individuals, and 19.6% had someone living alone who was 65 years of age or older. The average household size was 2.22 and the average family size was 2.77. The median age in the city was 46.4 years. 21.9% of residents were under the age of 18; 6.4% were between the ages of 18 and 24; 20.3% were from 25 to 44; 25.1% were from 45 to 64; and 26.2% were 65 years of age or older. The gender makeup of the city was 46.6% male and 53.4% female. 2000 census As of the census of 2000, there were 1,006 people, 424 households, and 267 families living in the city. The population density was . There were 454 housing units at an average density of . The racial makeup of the city was 99.50% White, 0.10% from other races, and 0.40% from two or more races. Hispanic or Latino people of any race were 0.30% of the population. There were 424 households, out of which 25.9% had children under the age of 18 living with them, 55.4% were married couples living together, 6.1% had a female householder with no husband present, and 36.8% were non-families. 33.0% of all households were made up of individuals, and 23.1% had someone