DeWitt Charter Township is a charter township of Clinton County in the U.S. state of Michigan. The population was 15,073 at the 2020 census, which was an increase from 14,321 at the 2010 census. The original survey township now includes portions of the cities of DeWitt, East Lansing, and Lansing, but all are administered autonomously or throu…DeWitt Charter Township is a charter township of Clinton County in the U.S. state of Michigan. The population was 15,073 at the 2020 census, which was an increase from 14,321 at the 2010 census. The original survey township now includes portions of the cities of DeWitt, East Lansing, and Lansing, but all are administered autonomously or through 425 Agreements.