As of the census[2] of 2000, there were 3,630 people, 1,467 households, and 1,007 families residing in the township.

There were 1,577 housing units at an average density of 235.9 per square mile (91.1/km2).

The racial makeup of the township was 98.57% White, 0.22% African American, 0.28% Native American, 0.19% Asian, 0.03% Pacific Islander, 0.06% from other races, and 0.66% from two or more races.

27.8% of all households were made up of individuals, and 15.3% had someone living alone who was 65 years of age or older.

East China Township is home to the St. Clair and Belle River Power Plants.