Garrison is a city in Benton County, Iowa, United States. The population was 344 at the time of the 2020 census. It is part of the Cedar Rapids Metropolitan Statistical Area. It was named for the farmer, Nelson Garrison, who had the post office in his home west of town. He owned the property.(1872). Geography 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 371 people, 145 households, and 99 families living in the city. The population density was . There were 166 housing units at an average density of . The racial makeup of the city was 96.2% White, 1.1% African American, 0.3% from other races, and 2.4% from two or more races. Hispanic or Latino of any race were 1.6% of the population. There were 145 households, of which 34.5% had children under the age of 18 living with them, 50.3% were married couples living together, 11.7% had a female householder with no husband present, 6.2% had a male householder with no wife present, and 31.7% were non-families. 22.8% of all households were made up of individuals, and 11% had someone living alone who was 65 years of age or older. The average household size was 2.56 and the average family size was 2.90. The median age in the city was 40.3 years. 24.5% of residents were under the age of 18; 8.7% were between the ages of 18 and 24; 24.3% were from 25 to 44; 29.1% were from 45 to 64; and 13.5% were 65 years of age or older. The gender makeup of the city was 47.4% male and 52.6% female. 2000 census As of the census of 2000, there were 413 people, 159 households, and 113 families living in the city. The population density was . There were 177 housing units at an average density of . The racial makeup of the city was 97.82% White, 0.24% African American, 0.73% Asian, 0.24% from other races, and 0.97% from two or more races. Hispanic or Latino of any race were 1.69% of the population. There were 159 households, out of which 32.7% had children under the age of 18 living with them, 58.5% were married couples living together, 11.3% had a female householder with no husband present, and 28.9% were non-families. 25.2% of all households were