Garrison is a city in Benton County, Iowa, United States.

It was named for the farmer, Nelson Garrison, who had the post office in his home west of town.

[3] According to the United States Census Bureau, the city has a total area of 0.25 square miles (0.65 km2), all land.

There were 153 housing units at an average density of 497.2 per square mile (192.0/km2).

Hispanic or Latino persons of any race comprised 4.1% of the population.

There were 166 housing units at an average density of 664.0 per square mile (256.4/km2).

22.8% of all households were made up of individuals, and 11% had someone living alone who was 65 years of age or older.

There were 177 housing units at an average density of 717.1 per square mile (276.9/km2).

25.2% of all households were made up of individuals, and 10.1% had someone living alone who was 65 years of age or older.

Ten theatre colleagues formed the company in a vacant building that had once served the community of Garrison as a co-op dairy.