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is a charter township of Macomb County in the U.S. state of Michigan. As of the 2000 census, the population was 24,461.
According to the United States Census Bureau, the township has a total area of 23.8 square miles (61.5 km²), of which, 14.3 square miles (37.0 km²) of it is land and 9.4 square miles (24.5 km²) of it (39.79%) is water.
Harrison Township sits along Lake St.Clair in the southeast region of Michigan.