- Machine Shop, Cambridge
- Machine Shop & Tool Repair Service, Cambridge
- Machine Shop Equipment & Supplies, Cambridge
- Machine Shop Rotary Surface Grinding, Cambridge - Tool Grinding & Sharpening
- Machine Tool Repair & Rebuild, Cambridge
- Machine Tools , Cambridge
- Machinery And Equipment Manufacturers, Cambridge
- Machinery Custom Design Manufacturers, Cambridge
- Machinery Movers & Erectors, Cambridge
- Machinery Repair & Rebuild, Cambridge
- Machinery, Supplies & Equipment - Business Production Related, Cambridge
- Machinery, Supplies & Equipment - Business Supplies Related, Cambridge
- Machinery, Supplies & Equipment - Construction & Contractor Related, Cambridge
- Magazine & Newspaper Stands, Cambridge - Dealers & Distributors
- Mailboxes Retail, Cambridge
- Mailing List Service, Brokers & Compilers, Cambridge
- Mailing, Delivery & Courier Service, Cambridge
- Maintenance, Cleaning & Sanitation, Cambridge
- Major Appliances, Cambridge - Household & Kitchen
- Malls & Shopping Centers, Cambridge
- Management Consultants & Services, Cambridge
- Management Training & Development, Cambridge
- Manicurists & Pedicurists, Cambridge
- Manufacturers Agents & Representatives, Cambridge
- Manufacturers Representative, Cambridge - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Cambridge
- Manufacturing & Industrial Consultants, Cambridge
- Manufacturing Products, Cambridge
- Marble, Cambridge
- Market Research & Analysis , Cambridge - Market Analysis, Business & Economic Research
- Marketing Schools, Cambridge
- Marriage & Family Counselors, Cambridge
- Martial Arts & Self Defense Schools, Cambridge
- Masonry Contractors, Cambridge - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Cambridge
- Massage Therapists & Professional, Cambridge
- Massage Therapy, Cambridge
- Mastectomy Apparel, Forms, Prostheses & Supplies, Cambridge
- Material Handling Equipment, Cambridge - Conveyor Belt, Pallet Jack, Forklift, etc
- Mats & Matting, Cambridge
- Maytag Appliances, Cambridge
- Meat Packers, Cambridge
- Mechanical Contractors, Cambridge - Install, Service & Repair
- Medical Equipment & Supplies Rental & Leasing, Cambridge
- Medical Supplies & Equipment, Cambridge
- Meeting & Event Planning Services, Cambridge - Conference Consultants
- Membership Sports & Recreation Clubs, Cambridge
- Men's & Boys Clothing & Accessories Stores, Cambridge
- Men's Clothing Stores, Cambridge - Clothes & Accessories
- Men's Shoe Stores, Cambridge
- Mennonite Church, Cambridge
- Mens & Boys Belts & Suspenders, Cambridge
- Mens & Boys Jeans & Western Wear Stores, Cambridge
- Mens & Womens Clothing, Cambridge
- Mental Health Specialists, Cambridge - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Cambridge
- Messenger Service, Cambridge - Message Receiving & Forwarding Service
- Metal Buildings, Cambridge - Kits, Homes, Steel Buildings, etc
- Metal Cleaning & Pickling, Cambridge
- Metal Coating & Allied Services, Cambridge
- Metal Finishers, Cambridge
- Metal Galvanizing, Cambridge
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- Metal Heat Treating, Cambridge
- Metal Plating & Polishing, Cambridge
- Metal Products, Cambridge
- Metal Repair Service & Blacksmith, Cambridge - Iron Works
- Metal Services, Cambridge
- Metal Specialties, Cambridge
- Metal Stampings Manufacturers, Cambridge
- Metal Working Machinery, Cambridge
- Metallurgical Testing Labs, Cambridge
- Metaphysical Churches, Cambridge
- Mexican Restaurants, Cambridge
- Middle Eastern Restaurants, Cambridge
- Midwives, Cambridge
- Mildew Removal & Control, Cambridge - Mold Removal
- Millwork Contractors, Cambridge
- Millwrights, Cambridge
- Mini & Self Storage, Cambridge
- Mini Golf Courses, Cambridge
- Mining, Cambridge
- Mining Equipment & Supplies, Cambridge
- Ministries Church, Cambridge
- Miscellaneous Household Item Repair, Cambridge
- Miscellaneous Agriculture, Cambridge
- Miscellaneous Business Services, Cambridge
- Miscellaneous Government, Cambridge
- Miscellaneous Industry, Cambridge
- Miscellaneous Manufacturing, Cambridge
- Miscellaneous Metal Work Manufacturers, Cambridge
- Miscellaneous Personal Services, Cambridge
- Miscellaneous Professional, Cambridge
- Mission Churches, Cambridge
- Mobile Home Parks & Communities , Cambridge
- Molds Manufacturers, Cambridge
- Money Transfer Service, Cambridge
- Monuments, Tombstones, Markers & Memorials, Cambridge
- Mortgage Bankers & Correspondents, Cambridge
- Mortgage Brokers, Cambridge
- Motion Picture & Television Production Services, Cambridge
- Motion Picture Dists & Producers, Cambridge
- Motion Picture Pre & Post Production Services, Cambridge
- Motion Picture Special Effects, Cambridge
- Motivational & Self Improvement Schools, Cambridge
- Motor Vehicle, Cambridge
- Motor Vehicle Rental & Leasing, Cambridge
- Motorcycle Parts, Accessories & Dealers, Cambridge
- Mountain & Ice Climbing Tours, Cambridge
- Moving & Storage Supplies & Equipment, Cambridge
- Moving Companies, Cambridge
- Moving Truck Rental , Cambridge
- Muffler Shop & Exhaust Systems, Cambridge
- Murals & Faux Finish Walls, Cambridge
- Museums, Cambridge
- Music, Cambridge
- Music Entertainment, Cambridge
- Music Lessons, Cambridge
- Music Lessons - Instrumental, Cambridge
- Musical Instruments & Equipment Stores, Cambridge
- Musical Instruments Repair, Sales & Service, Cambridge
- Musical Recording Services, Cambridge
- Musicians, Bands & Disc Jockeys, Cambridge
- Muslim Church, Cambridge
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