- Cabins Cottages & Chalet Rental, Orono
- Cafe Restaurants, Orono
- Campgrounds, Orono
- Candy, Nut & Confectionery Wholesale & Retail, Orono - Candy Stores
- Canoes & Kayaks, Orono - Equipment, Gear, PFD, Paddles & Accessories
- Casual Dining Restaurants, Orono
- Caterers Food Services, Orono
- Christian Churches, Orono
- City & County Government, Orono
- Cleaning Supplies, Systems & Equipment, Orono - Janitorial Supplies
- Coffee, Orono
- Commercial Printing, Orono
- Commercial Printing Manufacturers, Orono
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- Community Services, Orono
- Concrete, Orono - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Orono
- Concrete Breaking, Coring, Cutting, Drilling & Sawing, Orono
- Concrete Contractors, Orono - Concrete Construction & Concrete Companies
- Concrete Product Manufacturers, Orono
- Construction, Orono
- Consultants & Services, Orono
- Convenience Stores, Orono
- Convention & Meeting Facilities, Orono - Meeting Rooms
- Conveyor & Conveying Equipment, Orono - Conveyor Belt
- Country Cooking Restaurants, Orono
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