[3] Idun Township was named for Iðunn, a god of Norse mythology.

As of the census[1] of 2000, there were 235 people, 95 households, and 62 families residing in the township.

There were 195 housing units at an average density of 5.3 per square mile (2.0/km2).

30.5% of all households were made up of individuals, and 6.3% had someone living alone who was 65 years of age or older.

About 6.8% of families and 13.3% of the population were below the poverty line, including 12.2% of those under the age of eighteen and 13.0% of those 65 or over.