- Machine Shop, Markham
- Machine Shop & Tool Repair Service, Markham
- Machine Shop Equipment & Supplies, Markham
- Machine Tool Repair & Rebuild, Markham
- Machine Tools , Markham
- Machinery And Equipment Manufacturers, Markham
- Machinery Custom Design Manufacturers, Markham
- Machinery Movers & Erectors, Markham
- Machinery, Supplies & Equipment - Business Production Related, Markham
- Machinery, Supplies & Equipment - Business Supplies Related, Markham
- Machinery, Supplies & Equipment - Construction & Contractor Related, Markham
- Magazine & Newspaper Stands, Markham - Dealers & Distributors
- Magnetic & Optical Recording Media Manufacturers, Markham
- Magnetic Devices, Markham
- Magnets & Magnetic Devices, Markham
- Mailboxes Retail, Markham
- Mailing List Service, Brokers & Compilers, Markham
- Mailing, Delivery & Courier Service, Markham
- Maintenance, Cleaning & Sanitation, Markham
- Major Appliances, Markham - Household & Kitchen
- Malls & Shopping Centers, Markham
- Management Consultants & Services, Markham
- Management Training & Development, Markham
- Manicurists & Pedicurists, Markham
- Manufactured & Mobile Home Movers & Transporting, Markham
- Manufacturers Agents & Representatives, Markham
- Manufacturers Representative, Markham - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Markham
- Manufacturing Equipment & Supplies, Markham
- Manufacturing Products, Markham
- Manufacturing Services, Markham
- Map Publishers & Printers, Markham
- Mapping & Topographical Services, Markham
- Marble, Markham
- Marinas & Marina Services, Markham
- Marine Supplies & Equipment, Markham - Boat Supplies
- Market Research & Analysis , Markham - Market Analysis, Business & Economic Research
- Marketing Schools, Markham
- Markets & Grocers Equipment, Markham
- Marking Device Equipment & Supplies, Markham
- Marking, Stamping & Engraving Equipment, Markham
- Marriage & Family Counselors, Markham
- Martial Arts & Self Defense Schools, Markham
- Masonry Contractors, Markham - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Markham
- Massage Equipment & Supplies, Markham
- Massage Parlor & Steam Bath Services, Markham
- Massage Therapists & Professional, Markham
- Massage Therapy, Markham
- Mastectomy Apparel, Forms, Prostheses & Supplies, Markham
- Material Handling Equipment, Markham - Conveyor Belt, Pallet Jack, Forklift, etc
- Maternity Clothes & Clothing Stores, Markham - Maternity Dress, Gown, Swimwear, Underwear & More
- Maytag Appliances, Markham
- Meat Market, Wholesale & Products, Markham
- Meat Packers, Markham
- Mechanical Contractors, Markham - Install, Service & Repair
- Medical & Health Service Organizations, Markham
- Medical Alert Systems, Markham - Medical Alarms - PERS
- Medical Diagnostic Imaging, Markham
- Medical Groups & Clinics, Markham - Medical & Health Centers
- Medical Supplies & Equipment, Markham
- Meeting & Event Planning Services, Markham - Conference Consultants
- Membership Sports & Recreation Clubs, Markham
- Men's & Boys Clothing & Accessories Stores, Markham
- Men's Clothing Stores, Markham - Clothes & Accessories
- Men's Shoe Stores, Markham
- Mennonite Church, Markham
- Mens & Boys Belts & Suspenders, Markham
- Mens & Womens Clothing, Markham
- Mental Health Specialists, Markham - Psychologist, Psychiatrist, Psychotherapist, etc
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- Metal Buildings, Markham - Kits, Homes, Steel Buildings, etc
- Metal Coating & Allied Services, Markham
- Metal Finishers, Markham
- Metal Plating & Polishing, Markham
- Metal Repair Service & Blacksmith, Markham - Iron Works
- Metal Specialties, Markham
- Metal Spinning Manufacturers, Markham
- Metal Stampings Manufacturers, Markham
- Metal Working Machinery, Markham
- Metals, Markham
- Methodist Church, Markham
- Mexican Restaurants, Markham
- Microfilm & Imaging Service, Equipment & Supplies , Markham
- Middle Eastern Restaurants, Markham
- Midwives, Markham
- Millwork Contractors, Markham
- Millwrights, Markham
- Mini & Self Storage, Markham
- Mini Golf Courses, Markham
- Mining, Markham
- Mining Contractors, Markham - Mining Companies, Contractors & Brokers
- Mining Development & Exploration, Markham
- Mining Equipment & Supplies, Markham
- Mining Services, Markham
- Mining, Crude-Oil Production, Markham - Mining Companies
- Mirrors, Markham - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Markham
- Miscellaneous Household Item Repair, Markham
- Miscellaneous Agriculture, Markham
- Miscellaneous Business Services, Markham
- Miscellaneous Government, Markham
- Miscellaneous Industry, Markham
- Miscellaneous Manufacturing, Markham
- Miscellaneous Metal Work Manufacturers, Markham
- Miscellaneous Personal Services, Markham
- Miscellaneous Professional, Markham
- Mission Churches, Markham
- Mobile Communications 2 Way Radios Sales & Service, Markham
- Modular & Mobile Homes For Sale, Markham - Manufactured Homes Sale & Service
- Modular Buildings, Markham - Modular Homes Buildings & Offices
- Moldings Materials, Markham
- Molds Manufacturers, Markham
- Money Transfer Service, Markham
- Monuments, Tombstones, Markers & Memorials, Markham
- Mortgage Bankers & Correspondents, Markham
- Mortgage Brokers, Markham
- Mosques, Markham
- Motion Picture & Television Production Services, Markham
- Motion Picture Dists & Producers, Markham
- Motion Picture Pre & Post Production Services, Markham
- Motivational Speakers & Consultants, Markham - Speakers, Lectures & Seminars
- Motor Vehicle, Markham
- Motor Vehicle Rental & Leasing, Markham
- Motorcycle Parts, Accessories & Dealers, Markham
- Movie Theaters, Markham
- Moving Companies, Markham
- Moving Truck Rental , Markham
- Muffler Shop & Exhaust Systems, Markham
- Multimedia Publishers, Markham - Multimedia Services & Systems
- Museums, Markham
- Music, Markham
- Music Background Leased, Markham
- Music Lessons, Markham
- Music Lessons - Instrumental, Markham
- Music Lessons - Vocal, Markham
- Music Sheet, Markham
- Music Stores Retail, Markham
- Musical Instrument Manufacturers, Markham
- Musical Instruments & Equipment Stores, Markham
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