Leoni Township is a civil township of Jackson County in the U.S. state of Michigan. The population was 13,459 at the 2000 census.Communities Leoni is a small, unincorporated community within the township, several miles east of Jackson. Michigan Center is an unincorporated community and a census-designated place within the township.GeographyAccording to the United States Census Bureau, the township has a total area of 51.2sqmi, of which 49.1sqmi is land and 2.1sqmi (4.14%) is water.DemographicsAs of the census of 2000, there were 13,459 people, 5,240 households, and 3,825 families residing in the township. The population density was 274.1 per square mile (105.8/km²). There were 5,568 housing units at an average density of 113.4 per square mile (43.8/km²). The racial makeup of the township was 97.04% White, 0.82% African American, 0.31% Native American, 0.33% Asian, 0.02% Pacific Islander, 0.31% from other races, and 1.17% from two or more races. Hispanic or Latino of any race were 1.62% of the population.