Tompkins Township is a civil township of Jackson County in the U.S. state of Michigan. The population was 2,758 at the 2000 census.GeographyAccording to the United States Census Bureau, the township has a total area of 36.4sqmi, of which 36.1sqmi is land and 0.3sqmi (0.77%) is water.DemographicsAs of the census of 2000, there were 2,758 people, 985 households, and 781 families residing in the township. The population density was 76.4 per square mile (29.5/km²). There were 1,032 housing units at an average density of 28.6 per square mile (11.0/km²). The racial makeup of the township was 96.74% White, 0.51% African American, 0.18% Native American, 0.15% Asian, 0.80% from other races, and 1.63% from two or more races. Hispanic or Latino of any race were 1.34% of the population.There were 985 households out of which 38.6% had children under the age of 18 living with them, 67.0% were married couples living together, 7.6% had a female householder with no husband present, and 20.7% were non-families. 17.2% of all households were made up of individuals and 6.6% had someone living alone who was 65 years of age or older. The average household size was 2.79 and the average family size was 3.13.