Edison, township (1990 pop. 88,680), Middlesex co., NE N.J., inc. 1870 as Raritan Township, renamed 1954. Edison's varied manufactures include light trucks, chemicals, metal products, electrical and electronic equipment, machinery, and instruments. Raritan Center is the largest industrial park east of the Mississippi. Menlo Park, the former site of Thomas A. Edison's laboratories, now is a residential community in the township.