MASSCO is a distributor of facility supplies including janitorial, industrial, maintenance and office supplies with warehouses in Kansas, Missouri and Oklahoma. MASSCO is known for helping organizations by customizing programs that address the primary needs of businesses today. Enhanced Image Improved Wellness and Safety Increased Productivity Lower Total Costs Sustainability MASSCO delivers names you can trust. We are proud of the brands we represent and of our manufacturers who have invested significant resources in research and development.