- Machine Shop & Tool Repair Service, Lowell
- Machinery And Equipment Manufacturers, Lowell
- Machinery, Supplies & Equipment - Business Supplies Related, Lowell
- Machinery, Supplies & Equipment - Construction & Contractor Related, Lowell
- Mailing, Delivery & Courier Service, Lowell
- Management Consultants & Services, Lowell
- Manicurists & Pedicurists, Lowell
- Manufacturing, Lowell
- Market Research & Analysis , Lowell - Market Analysis, Business & Economic Research
- Masonry Contractors, Lowell - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Lowell
- Mechanical Contractors, Lowell - Install, Service & Repair
- Medical & Dental Management, Lowell
- Meeting & Event Planning Services, Lowell - Conference Consultants
- Membership Sports & Recreation Clubs, Lowell
- Metal Buildings, Lowell - Kits, Homes, Steel Buildings, etc
- Metal Distributors, Lowell
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- Mexican Restaurants, Lowell
- Mini & Self Storage, Lowell
- Mini Golf Courses, Lowell
- Miscellaneous Business Credit Institutions & Services, Lowell
- Miscellaneous Agriculture, Lowell
- Miscellaneous Government, Lowell
- Miscellaneous Industry, Lowell
- Miscellaneous Personal Services, Lowell
- Miscellaneous Professional, Lowell
- Mobile Home Insurance, Lowell
- Modular & Mobile Homes For Sale, Lowell - Manufactured Homes Sale & Service
- Motor Vehicle, Lowell
- Motor Vehicle Rental & Leasing, Lowell
- Moving Companies, Lowell
- Moving Supplies & Equipment Rental, Lowell
- Moving Truck Rental , Lowell
- Muffler Shop & Exhaust Systems, Lowell
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