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Mason Area Chamber of Commerce Join the MACC The Mason Area Chamber of Commerce is not just an organization its a dynamic organization that fosters growth collaboration and success. Becoming a Chamber member your business will gain access to a network of likeminded professionals creating opportunities for partnerships collaborations and business expansion. About the MACC The Mason Chamber of Commerce in Michigan is a dynamic and proactive organization dedicated to fostering economic growth and development in the city of Mason and its surrounding areas. With a strong focus on supporting local businesses the chamber provides resources networking opportunities and advocacy to help its members thrive.