- Machine Shop & Tool Repair Service, Fitchburg
- Machinery, Supplies & Equipment - Business Production Related, Fitchburg
- Machinery, Supplies & Equipment - Business Supplies Related, Fitchburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Fitchburg
- Mailbox Rental Services, Fitchburg
- Mailing, Delivery & Courier Service, Fitchburg
- Major Appliance Repair & Service, Fitchburg
- Major Appliances, Fitchburg - Household & Kitchen
- Malls & Shopping Centers, Fitchburg
- Management Consultants & Services, Fitchburg
- Manicurists & Pedicurists, Fitchburg
- Manufacturing, Fitchburg
- Map Publishers & Printers, Fitchburg
- Mapping & Topographical Services, Fitchburg
- Maps & Supplies, Fitchburg
- Marketing Consultants Professional Practices, Fitchburg
- Marriage & Family Counselors, Fitchburg
- Martial Arts & Self Defense Schools, Fitchburg
- Masonry Materials & Supplies, Fitchburg
- Massage Therapists & Professional, Fitchburg
- Massage Therapy, Fitchburg
- Massage Therapy Relaxation, Fitchburg
- Meat Market, Wholesale & Products, Fitchburg
- Mechanical Engineer, Fitchburg - Mechanical Engineering Service
- Medical Attorneys & Lawyers, Fitchburg
- Medical Attorneys & Lawyers, Fitchburg
- Medical Lawyers & Attorneys, Fitchburg
- Medical Supplies & Equipment, Fitchburg
- Meeting & Event Planning Services, Fitchburg - Conference Consultants
- Membership Sports & Recreation Clubs, Fitchburg
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- Men's Clothing Stores, Fitchburg - Clothes & Accessories
- Mental Health Specialists, Fitchburg - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Marketing Consultants, Fitchburg
- Methodist Church, Fitchburg
- Mexican Restaurants, Fitchburg
- Mind-Body Massage, Fitchburg
- Miscellaneous Agriculture, Fitchburg
- Miscellaneous Government, Fitchburg
- Miscellaneous Manufacturing, Fitchburg
- Miscellaneous Personal Services, Fitchburg
- Miscellaneous Professional, Fitchburg
- Mortgage Bankers & Correspondents, Fitchburg
- Mortgages & Loans, Fitchburg
- Motion Picture & Television Production Services, Fitchburg
- Motion Picture Equipment & Supplies, Fitchburg
- Motion Picture Pre & Post Production Services, Fitchburg
- Motion Picture Projection Service, Fitchburg
- Motor Vehicle, Fitchburg
- Motor Vehicle Rental & Leasing, Fitchburg
- Movie Theaters, Fitchburg
- Moving & Storage Supplies & Equipment, Fitchburg
- Moving Companies, Fitchburg
- Moving Supplies & Equipment Rental, Fitchburg
- Moving Truck Rental , Fitchburg
- Muffler Shop & Exhaust Systems, Fitchburg
- Music, Fitchburg
- Music Lessons, Fitchburg
- Music Lessons - Instrumental, Fitchburg
- Musical Instruments & Equipment Stores, Fitchburg
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