- Machine Shop, Fitchburg
- Machine Shop & Tool Repair Service, Fitchburg
- Machine Tools Manufacturers Metal Cutting Types, Fitchburg
- Machinery And Equipment Manufacturers, Fitchburg
- Machinery Repair & Rebuild, Fitchburg
- Machinery, Supplies & Equipment - Business Production Related, Fitchburg
- Machinery, Supplies & Equipment - Business Supplies Related, Fitchburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Fitchburg
- Mailing, Delivery & Courier Service, Fitchburg
- Maintenance, Cleaning & Sanitation, Fitchburg
- Major Appliances, Fitchburg - Household & Kitchen
- Management Consultants & Services, Fitchburg
- Manicurists & Pedicurists, Fitchburg
- Manufacturing, Fitchburg
- Manufacturing Products, Fitchburg
- Marinas & Marina Services, Fitchburg
- Market Research & Analysis , Fitchburg - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Fitchburg
- Martial Arts & Self Defense Schools, Fitchburg
- Masonry Contractors, Fitchburg - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Fitchburg
- Massage Therapists & Professional, Fitchburg
- Massage Therapy, Fitchburg
- Meat Market, Wholesale & Products, Fitchburg
- Medical Equipment Manufacturers, Fitchburg
- Medical Supplies & Equipment, Fitchburg
- Medical Transcription Service, Fitchburg
- Membership Sports & Recreation Clubs, Fitchburg
- Mental Health Specialists, Fitchburg - Psychologist, Psychiatrist, Psychotherapist, etc
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- Merchandise Sales Events, Fitchburg
- Metal Buildings, Fitchburg - Kits, Homes, Steel Buildings, etc
- Metal Roofs, Fitchburg
- Metalworking Machinery Manufacturers, Fitchburg
- Metaphysical Churches, Fitchburg
- Mexican Restaurants, Fitchburg
- Middle Eastern Restaurants, Fitchburg
- Mildew Removal & Control, Fitchburg - Mold Removal
- Millwork Contractors, Fitchburg
- Mining, Fitchburg
- Ministries Church, Fitchburg
- Miscellaneous Business Product Repair, Fitchburg
- Miscellaneous Household Item Repair, Fitchburg
- Miscellaneous Government, Fitchburg
- Miscellaneous Personal Services, Fitchburg
- Miscellaneous Professional, Fitchburg
- Molds, Fitchburg
- Monuments Cleaning, Fitchburg
- Monuments, Tombstones, Markers & Memorials, Fitchburg
- Mortgage Bankers & Correspondents, Fitchburg
- Motor Vehicle, Fitchburg
- Motor Vehicle Rental & Leasing, Fitchburg
- Motorcycle Parts, Accessories & Dealers, Fitchburg
- Movie Theaters, Fitchburg
- Moving Companies, Fitchburg
- Moving Truck Rental , Fitchburg
- Muffler Shop & Exhaust Systems, Fitchburg
- Museums, Fitchburg
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