Iona is a city in Bonneville County, Idaho and is part of the Idaho Falls, Idaho Metropolitan Statistical Area. The population was 1,803 at the 2010 census.
As of the census of 2010, there were 1,803 people, 578 households, and 481 families residing in the city. The population density was 1,639.1 inhabitants per square mile. There were 601 housing units at an average density of 546.4 per square mile. The racial makeup of the city was 97.7% White, 0.2% African American, 0.3% Native American, 0.1% Asian, 0.7% from other races, and 1.1% from two or more races.
There were 578 households of which 45.7% had children under the age of 18 living with them, 72.7% were married couples living together, 6.2% had a female householder with no husband present, 4.3% had a male householder with no wife present, and 16.8% were non-families. 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. The average household size was 3.12 and the average family size was 3.44.
The median age in the city was 31.5 years. 35.1% of residents were under the age of 18; 6.6% were between the ages of 18 and 24; 25.8% were from 25 to 44; 21.1% were from 45 to 64; and 11.5% were 65 years of age or older. The gender makeup of the city was 49.1% male and 50.9% female.