Franklin County has a very diverse and vibrant manufacturing base.  It is home to four international companies.  The largest of these is Nissan’s automotive engine and powertrain facility. The other international companies are Tepro, a Japanese automotive weather stripping manufacturer, Zanini, a Spanish producer of plastic automotive wheel covers, and Hamilton Kent  a Canadian company that manufacturers rubber gaskets for the utility and construction industries.

Franklin County also has a strong service and support industry base.  Located at the northern end of Franklin County is Arnold Engineering Development Center.  It is the most advanced and largest complex of flight simulation test facilities in the world. The center employs over 2700 highly skilled engineers and craftsman and operates 58 aerodynamic and propulsion wind tunnels, rocket and turbine engine test cells, space environmental chambers, and other specialized units.  Because of this diversity and high technology industries Franklin County has several metal fabrication and precision machining facilities.