[4] As of the census[1] of 2000, there were 2,401 people, 872 households, and 645 families residing in the township.

There were 957 housing units at an average density of 27.3 per square mile (10.5/km2).

There were 872 households, out of which 30.3% had children under the age of 18 living with them, 63.0% were married couples living together, 7.1% had a female householder with no husband present, and 26.0% were non-families.

19.6% of all households were made up of individuals, and 7.1% had someone living alone who was 65 years of age or older.

Most of Jefferson Township is zoned to Cassopolis Public Schools.