- 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
- Maintenance, Cleaning & Sanitation, Lowell
- Manicurists & Pedicurists, Lowell
- Manufacturing, Lowell
- Manufacturing Products, Lowell
- Manufacturing Services, Lowell
- Marinas & Marina Services, Lowell
- Marriage & Family Counselors, Lowell
- Masonry Contractors, Lowell - Stone Mason, Brick Mason - Install & Repair
- Meat Market, Wholesale & Products, Lowell
- Mechanical Contractors, Lowell - Install, Service & Repair
- Medical Supplies & Equipment, Lowell
- Mental Health Specialists, Lowell - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Lowell
- Mexican Restaurants, Lowell
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- Mildew Removal & Control, Lowell - Mold Removal
- Mini & Self Storage, Lowell
- Miscellaneous Government, Lowell
- Miscellaneous Professional, Lowell
- Mission Churches, Lowell
- Mobile Home Parks & Communities , Lowell
- Molds, Lowell
- Monuments, Tombstones, Markers & Memorials, Lowell
- Mortgage Bankers & Correspondents, Lowell
- Mortgage Brokers, Lowell
- Motion Picture Pre & Post Production Services, Lowell
- Motor Vehicle, Lowell
- Motor Vehicle Rental & Leasing, Lowell
- Motorcycle & Motor Scooters Dealers, Repair & Service, Lowell
- Motorcycle Repair & Service, Lowell
- Moving Supplies & Equipment Rental, Lowell
- Moving Truck Rental , Lowell
- Museums, Lowell
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