[3] The city of Ionia is mostly within the township, but is administratively autonomous.

As of the census[1] of 2000, there were 3,669 people, 1,335 households, and 1,022 families residing in the township.

There were 1,441 housing units at an average density of 42.8 per square mile (16.5/km2).

There were 1,335 households, out of which 37.2% had children under the age of 18 living with them, 59.6% were married couples living together, 11.5% had a female householder with no husband present, and 23.4% were non-families.

18.7% of all households were made up of individuals, and 6.8% had someone living alone who was 65 years of age or older.