Summit Township is a civil township of Jackson County in the U.S. state of Michigan. The population was 21,534 at the 2000 census.Communities Vandercook Lake is an unincorporated community and census-designated place within the township.GeographyAccording to the United States Census Bureau, the township has a total area of 29.9 square miles (77.4 km²), of which 29.3 square miles (75.8 km²) is land and 0.6 square mile (1.6 km²) (2.01%) is water.The township encompasses the T3S R1W survey township.DemographicsAs of the census of 2000, there were 21,534 people, 8,690 households, and 6,187 families residing in the township. The population density was 735.4 per square mile (284.0/km²). There were 9,109 housing units at an average density of 311.1 per square mile (120.1/km²). The racial makeup of the township was 91.72% White, 4.21% African American, 0.26% Native American, 1.46% Asian, 0.08% Pacific Islander, 0.64% from other races, and 1.63% from two or more races. Hispanic or Latino of any race were 1.85% of the population.
