- Machinery, Supplies & Equipment - Business Production Related, Orono
- Machinery, Supplies & Equipment - Business Supplies Related, Orono
- Machinery, Supplies & Equipment - Construction & Contractor Related, Orono
- Major Appliances, Orono - Household & Kitchen
- Manufacturing, Orono
- Manufacturing Products, Orono
- Marinas & Marina Services, Orono
- Marine Supplies & Equipment, Orono - Boat Supplies
- Masonry Materials & Supplies, Orono
- Massage Therapy, Orono
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- Meeting & Event Planning Services, Orono - Conference Consultants
- Membership Sports & Recreation Clubs, Orono
- Millwork Contractors, Orono
- Miscellaneous Government, Orono
- Miscellaneous Personal Services, Orono
- Miscellaneous Photographers, Orono
- Motor Vehicle, Orono
- Motor Vehicle Rental & Leasing, Orono
- Moving Truck Rental , Orono
- Museums, Orono
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