Dennison is a village in Tuscarawas County, Ohio, United States. The population was 2,992 at the 2000 census, while the 2006 Census Bureau estimate listed a population of 2,908.
The confluence of coal and railroads drove the development of Dennison. It is conveniently located at the midpoint between Pittsburgh and Columbus -- 100 miles (160 km) from each. At the time, locomotives needed water every 100 miles (160 km), so Dennison was a natural refilling location. The Dennison Coal Company had mines south of town.
In 1864, The Pittsburgh, Cincinnati & St. Louis Railway decided to locate the country's largest railroad shops and yards in Dennison. Dennison Land Company laid out the town of Dennison in 1865 and purchased land expressly for the town. The railyards spanned 40 acres (160,000 m2). Demand for passenger service led to construction of a station in 1873. Thousands moved to the area for jobs in the roundhouses, turntables and foundries. At its peak, 3,000 people worked in the railyards. The Pennsylvania Railroad Company eventually subsumed the Pittsburgh, Cincinnati & St. Louis Railway.