Jack'son, MICH., the county-seat of Jackson co., 76 mi. w. of Detroit, on the Grand River and on the Michigan Central, the Lake Shore & Michigan Southern, the Grand Trunk, the Cincinnati Northern and other railroads. The city is in an agricultural region and is an important railroad center. It has a considerable trade in agricultural produce and implements, and there are large railroad shops and extensive manufactures of carriages, wagons, machinery, flour, clay products and paper. The state prison is located at Jackson. The place was settled in 1829, but it did not grow rapidly until after the construction of the Michigan Central railroad. Population in 1910, 31,433.