- Machine Shop & Tool Repair Service, Lowell
- Machine Shop Rotary Surface Grinding, Lowell - Tool Grinding & Sharpening
- Machinery And Equipment Manufacturers, Lowell
- Machinery, Supplies & Equipment - Business Production Related, Lowell
- Machinery, Supplies & Equipment - Business Supplies Related, Lowell
- Machinery, Supplies & Equipment - Construction & Contractor Related, Lowell
- Mail Receiving & Forwarding Service, Lowell
- Mailbox Rental Services, Lowell
- Mailing, Delivery & Courier Service, Lowell
- Maintenance, Cleaning & Sanitation, Lowell
- Major Appliance Repair & Service, Lowell
- Major Appliances, Lowell - Household & Kitchen
- Management Consultants & Services, Lowell
- Mandarin Restaurants, Lowell
- Manicurists & Pedicurists, Lowell
- Manufacturers Agents & Representatives, Lowell
- Manufacturers Representative, Lowell - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Lowell
- Manufacturing & Industrial Consultants, Lowell
- Manufacturing Products, Lowell
- Manufacturing Services, Lowell
- Marketing Consultants Professional Practices, Lowell
- Marriage & Family Counselors, Lowell
- Martial Arts & Self Defense Schools, Lowell
- Masonry Contractors, Lowell - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Lowell
- Massage Equipment & Supplies, Lowell
- Massage Therapists & Professional, Lowell
- Massage Therapy, Lowell
- Material Handling, Lowell
- Material Handling & Heavy Machinery & Equipment, Lowell
- Material Handling Equipment, Lowell - Conveyor Belt, Pallet Jack, Forklift, etc
- Maternity Services, Lowell
- Measuring Instruments, Lowell - Measuring Machines & Equipment
- Meat Market, Wholesale & Products, Lowell
- Mechanical Contractors, Lowell - Install, Service & Repair
- Mechanical Engineer, Lowell - Mechanical Engineering Service
- Medical & Dental Management, Lowell
- Medical & Health Service Organizations, Lowell
- Medical Equipment Manufacturers, Lowell
- Medical Groups & Clinics, Lowell - Medical & Health Centers
- Medical Supplies & Equipment, Lowell
- Mediterranean Restaurants, Lowell
- Membership Sports & Recreation Clubs, Lowell
- Men's & Boys Clothing & Accessories Stores, Lowell
- Men's Clothing Stores, Lowell - Clothes & Accessories
- Mens & Boys Belts & Suspenders, Lowell
- Mental Health Specialists, Lowell - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Lowell
- Metal Buildings, Lowell - Kits, Homes, Steel Buildings, etc
- Metal Coating & Allied Services, Lowell
- Metal Finishers, Lowell
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- Metal Plating & Polishing, Lowell
- Metal Products, Lowell
- Metal Repair Service & Blacksmith, Lowell - Iron Works
- Metalworking Machinery Manufacturers, Lowell
- Methodist Church, Lowell
- Mexican Restaurants, Lowell
- Middle Eastern Restaurants, Lowell
- Mildew Removal & Control, Lowell - Mold Removal
- Mill Supplies & Equipment, Lowell - Milling Machines
- Mill Supply & Equipment, Lowell
- Mini & Self Storage, Lowell
- Mining, Lowell
- Ministries Church, Lowell
- Mirrors, Lowell - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Lowell
- Miscellaneous Household Item Repair, Lowell
- Miscellaneous Business Services, Lowell
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Lowell
- Miscellaneous Government, Lowell
- Miscellaneous Industry, Lowell
- Miscellaneous Manufacturing, Lowell
- Miscellaneous Personal Services, Lowell
- Miscellaneous Professional, Lowell
- Mission Churches, Lowell
- Money Counting & Wrapping, Lowell
- Money Transfer Service, Lowell
- Monuments, Tombstones, Markers & Memorials, Lowell
- Mortgage Bankers & Correspondents, Lowell
- Mortgage Companies, Lowell
- Motion Picture & Television Production Services, Lowell
- Motion Picture Dists & Producers, Lowell
- Motor Vehicle, Lowell
- Motor Vehicle Rental & Leasing, Lowell
- Movie Theaters, Lowell
- Moving & Storage Consultants, Lowell
- Moving & Storage Supplies & Equipment, Lowell
- Moving Companies, Lowell
- Moving Supplies & Equipment Rental, Lowell
- Moving Truck Rental , Lowell
- Muffler Shop & Exhaust Systems, Lowell
- Museums, Lowell
- Music, Lowell
- Music Entertainment, Lowell
- Music Lessons, Lowell
- Music Lessons - Instrumental, Lowell
- Music Sheet, Lowell
- Music Stores Retail, Lowell
- Musical Instrument Rental, Lowell - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Lowell
- Musical Instruments Repair, Sales & Service, Lowell
- Musical Recording Services, Lowell
- Musicians, Bands & Disc Jockeys, Lowell
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