Ionia is a city in Chickasaw County, Iowa, United States.

[5] According to the United States Census Bureau, the city has a total area of 0.55 square miles (1.42 km2), all land.

[6] As of the census of 2020,[8] there were 226 people, 109 households, and 70 families residing in the city.

There were 126 housing units at an average density of 223.4 per square mile (86.3/km2).

Hispanic or Latino persons of any race comprised 0.4% of the population.

There were 133 housing units at an average density of 241.8 per square mile (93.4/km2).

32.8% of all households were made up of individuals, and 17.6% had someone living alone who was 65 years of age or older.

There were 135 housing units at an average density of 241.9 per square mile (93.4/km2).

32.2% of all households were made up of individuals, and 16.5% had someone living alone who was 65 years of age or older.