- Machine Shop & Tool Repair Service, Leominster
- Machinery, Supplies & Equipment - Business Production Related, Leominster
- Machinery, Supplies & Equipment - Business Supplies Related, Leominster
- Machinery, Supplies & Equipment - Construction & Contractor Related, Leominster
- Mailing, Delivery & Courier Service, Leominster
- Major Appliances, Leominster - Household & Kitchen
- Malls & Shopping Centers, Leominster
- Management Consultants & Services, Leominster
- Manicurists & Pedicurists, Leominster
- Manufacturers Agents & Representatives, Leominster
- Manufacturers Representative, Leominster - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Leominster
- Manufacturing & Industrial Consultants, Leominster
- Manufacturing Products, Leominster
- Manufacturing Services, Leominster
- Marine Supplies & Equipment, Leominster - Boat Supplies
- Marriage & Family Counselors, Leominster
- Martial Arts & Self Defense Schools, Leominster
- Masonry Materials & Supplies, Leominster
- Massage Therapists & Professional, Leominster
- Massage Therapy, Leominster
- Mastectomy Apparel, Forms, Prostheses & Supplies, Leominster
- Material Handling & Heavy Machinery & Equipment, Leominster
- Material Handling Equipment Certification Bureaus, Leominster
- Maternity Clothes & Clothing Stores, Leominster - Maternity Dress, Gown, Swimwear, Underwear & More
- Meat Market, Wholesale & Products, Leominster
- Mechanical Engineer, Leominster - Mechanical Engineering Service
- Medical & Health Service Organizations, Leominster
- Medical Billing Services, Leominster
- Medical Equipment Manufacturers, Leominster
- Medical Supplies & Equipment, Leominster
- Membership Sports & Recreation Clubs, Leominster
- Men's Clothing Stores, Leominster - Clothes & Accessories
- Mental Health Specialists, Leominster - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Leominster
- Merle Norman Cosmetics, Leominster
- Metal Pigment & Paint Products, Leominster
- Metal Repair Service & Blacksmith, Leominster - Iron Works
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- Metaphysical Churches, Leominster
- Methodist Church, Leominster
- Mexican Restaurants, Leominster
- Mini & Self Storage, Leominster
- Miscellaneous Household Item Repair, Leominster
- Miscellaneous Business Services, Leominster
- Miscellaneous Government, Leominster
- Miscellaneous Manufacturing, Leominster
- Miscellaneous Personal Services, Leominster
- Miscellaneous Professional, Leominster
- Mobile Coffee & Food Service, Leominster
- Mobile Coffee & Food Service, Leominster
- Mobile Home Parks & Communities , Leominster
- Mobile Restaurants, Leominster
- Moldings Materials, Leominster
- Molds, Leominster
- Money Transfer Service, Leominster
- Monuments, Tombstones, Markers & Memorials, Leominster
- Mortgage Bankers & Correspondents, Leominster
- Mortgage Companies, Leominster
- Motion Picture Pre & Post Production Services, Leominster
- Motion Pictures Video Tape Duplication & Transfer Services, Leominster
- Motor Vehicle, Leominster
- Motor Vehicle Rental & Leasing, Leominster
- Motorcycle & Motor Scooters Dealers, Repair & Service, Leominster
- Motorcycle Parts, Accessories & Dealers, Leominster
- Motorcycle Repair & Service, Leominster
- Moving Companies, Leominster
- Moving Truck Rental , Leominster
- Muffler Shop & Exhaust Systems, Leominster
- Multimedia Publishers, Leominster - Multimedia Services & Systems
- Music, Leominster
- Music Entertainment, Leominster
- Music Lessons, Leominster
- Music Lessons - Instrumental, Leominster
- Music Sheet, Leominster
- Music Stores Retail, Leominster
- Musical Instruments & Equipment Stores, Leominster
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