- Management Consultants & Services, Orono
- Manufacturing, Orono
- Marine Supplies & Equipment, Orono - Boat Supplies
- Market Research & Analysis , Orono - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Orono
- Masonry Contractors, Orono - Stone Mason, Brick Mason - Install & Repair
- Medical Supplies & Equipment, Orono
- Men's & Boys Clothing & Accessories Stores, Orono
- Mens & Boys Jeans & Western Wear Stores, Orono
- Mental Health Specialists, Orono - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Orono
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- Mexican Restaurants, Orono
- Miscellaneous Business Product Repair, Orono
- Miscellaneous Business Services, Orono
- Miscellaneous Government, Orono
- Miscellaneous Professional, Orono
- Motor Vehicle, Orono
- Motor Vehicle Rental & Leasing, Orono
- Motorcycle Parts, Accessories & Dealers, Orono
- Movie Theaters, Orono
- Moving Truck Rental , Orono
- Muslim Church, Orono
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