According to the United States Census Bureau, Filer Charter Township has a total area of 16.1 square miles (42 km2), of which 0.4 square miles (1.0 km2), or 2.40%, are water.

[1] As of the census of 2000, there were 2,208 people, 886 households, and 676 families residing in the township.

There were 996 housing units at an average density of 62.9 per square mile (24.3/km2).

20.9% of all households were made up of individuals, and 12.0% had someone living alone who was 65 years of age or older.

Out of the total people living in poverty, 8.6% are under the age of 18 and 6.5% are 65 or older.