- Machine Shop, Cambridge
- Machine Shop & Tool Repair Service, Cambridge
- Machinery, Supplies & Equipment - Business Production Related, Cambridge
- Machinery, Supplies & Equipment - Business Supplies Related, Cambridge
- Machinery, Supplies & Equipment - Construction & Contractor Related, Cambridge
- Maintenance, Cleaning & Sanitation, Cambridge
- Major Appliances, Cambridge - Household & Kitchen
- Mammography Clinics, Cambridge - Breast Cancer Screening
- Management Consultants & Services, Cambridge
- Manicurists & Pedicurists, Cambridge
- Manufacturers Agents & Representatives, Cambridge
- Manufacturers Representative, Cambridge - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Cambridge
- Manufacturing Products, Cambridge
- Marinas & Marina Services, Cambridge
- Marriage & Family Counselors, Cambridge
- Martial Arts & Self Defense Schools, Cambridge
- Masonry Materials & Supplies, Cambridge
- Massage Therapists & Professional, Cambridge
- Massage Therapy, Cambridge
- Material Handling & Heavy Machinery & Equipment, Cambridge
- Mechanical Contractors, Cambridge - Install, Service & Repair
- Medical & Dental Management, Cambridge
- Medical Billing Services, Cambridge
- Medical Diagnostic Clinics, Cambridge - Clinical Labs & Centers
- Medical Identification Jewelry, Cambridge
- Medical Management & Business Administration Service, Cambridge
- Medical Supplies & Equipment, Cambridge
- Membership Sports & Recreation Clubs, Cambridge
- Mental Health Specialists, Cambridge - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Cambridge
- Merle Norman Cosmetics, Cambridge
- Metal Buildings, Cambridge - Kits, Homes, Steel Buildings, etc
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- Metal Stampings Manufacturers, Cambridge
- Methodist Church, Cambridge
- Mexican Restaurants, Cambridge
- Mildew Removal & Control, Cambridge - Mold Removal
- Mini & Self Storage, Cambridge
- Mining, Cambridge
- Miscellaneous Business Credit Institutions & Services, Cambridge
- Miscellaneous Household Item Repair, Cambridge
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Cambridge
- Miscellaneous Government, Cambridge
- Miscellaneous Industry, Cambridge
- Miscellaneous Manufacturing, Cambridge
- Miscellaneous Metal Work Manufacturers, Cambridge
- Miscellaneous Personal Services, Cambridge
- Miscellaneous Photographers, Cambridge
- Miscellaneous Professional, Cambridge
- Mobile Home Parks & Communities , Cambridge
- Monuments, Tombstones, Markers & Memorials, Cambridge
- Mortgage Bankers & Correspondents, Cambridge
- Mortgages & Loans, Cambridge
- Motion Picture & Television Production Services, Cambridge
- Motor Vehicle, Cambridge
- Motor Vehicle Rental & Leasing, Cambridge
- Motorcycle Parts, Accessories & Dealers, Cambridge
- Movie Theaters, Cambridge
- Moving Supplies & Equipment Rental, Cambridge
- Moving Truck Rental , Cambridge
- Muffler Shop & Exhaust Systems, Cambridge
- Museums, Cambridge
- Music Entertainment, Cambridge
- Musical Instruments Repair, Sales & Service, Cambridge
- Musicians, Bands & Disc Jockeys, Cambridge
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