- Machine Shop & Tool Repair Service, Lowell
- Machinery And Equipment Manufacturers, Lowell
- Machinery, Supplies & Equipment - Construction & Contractor Related, Lowell
- Mail Delivery Service, Lowell
- Mailbox Rental Services, Lowell
- Mailing, Delivery & Courier Service, Lowell
- Management Consultants & Services, Lowell
- Manicurists & Pedicurists, Lowell
- Manufacturing, Lowell
- Manufacturing Products, Lowell
- Martial Arts & Self Defense Schools, Lowell
- Masonry Materials & Supplies, Lowell
- Massage Therapy, Lowell
- Meat Market, Wholesale & Products, Lowell
- Meat Packers, Lowell
- Mechanical Contractors, Lowell - Install, Service & Repair
- Medical Diagnostic Clinics, Lowell - Clinical Labs & Centers
- Men's Clothing Stores, Lowell - Clothes & Accessories
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- Mental Health Specialists, Lowell - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Lowell
- Methodist Church, Lowell
- Mexican Restaurants, Lowell
- Mini & Self Storage, Lowell
- Miscellaneous Government, Lowell
- Miscellaneous Manufacturing, Lowell
- Miscellaneous Personal Services, Lowell
- Miscellaneous Professional, Lowell
- Mortgage Bankers & Correspondents, Lowell
- Motor Vehicle, Lowell
- Motor Vehicle Rental & Leasing, Lowell
- Moving & Storage Supplies & Equipment, Lowell
- Moving Companies, Lowell
- Moving Supplies & Equipment Rental, Lowell
- Moving Truck Rental , Lowell
- Muffler Shop & Exhaust Systems, Lowell
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