- Machinery Movers & Erectors, New Gloucester
- Machinery, Supplies & Equipment - Business Production Related, New Gloucester
- Machinery, Supplies & Equipment - Construction & Contractor Related, New Gloucester
- Management Consultants & Services, New Gloucester
- Manufacturing, New Gloucester
- Manufacturing Products, New Gloucester
- Manufacturing Services, New Gloucester
- Market Research & Analysis , New Gloucester - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, New Gloucester
- Masonry Contractors, New Gloucester - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, New Gloucester
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- Material Handling & Heavy Machinery & Equipment, New Gloucester
- Meat Market, Wholesale & Products, New Gloucester
- Membership Sports & Recreation Clubs, New Gloucester
- Miscellaneous Business Services, New Gloucester
- Miscellaneous Government, New Gloucester
- Miscellaneous Professional, New Gloucester
- Motor Vehicle, New Gloucester
- Motor Vehicle Rental & Leasing, New Gloucester
- Motorcycle Parts, Accessories & Dealers, New Gloucester
- Moving Truck Rental , New Gloucester
- Museums, New Gloucester
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