Calvert City, situated on the Tennessee River, is the turnstile for transportation in Marshall County as it has the only industrial river access, mainline railway and interstate highway interchanges in the county.  All modes of transportation linking Marshall County with the world must pass through Calvert City.  With these advantages, Calvert City possesses excellent resources for industrial development.  The city has sixteen (17) industrial plants.  Though metallurgical and steel processing plants are present, the major employer remains the chemical industry.  Collectively these seventeen companies employee approximately 3,800 people.