Iona is a city in Bonneville County, Idaho, United States.

According to the United States Census Bureau, the city has a total area of 1.10 square miles (2.85 km2), all of it land.

There were 601 housing units at an average density of 546.4 per square mile (211.0/km2).

14.0% of all households were made up of individuals, and 5.9% had someone living alone who was 65 years of age or older.

There were 385 housing units at an average density of 489.2 per square mile (188.9/km2).

12.4% of all households were made up of individuals, and 5.4% had someone living alone who was 65 years of age or older.