JACKSON, a town of North America, capital of a cognominal county in the state of Michigan, situate near the source of Grand River, 32 miles S. of Lansing. From its position on the Michigan Central Railway its trade is considerable, while the River Grand supplies sufficient water-power for driving a number of mills. Coal and good building stone abound in the neighbourhood. The town contains a court-house, jail, penitentiary, and five churches, and supports two newspapers. Pop. (1853) about 3600.