- Machine Shop, Oakville
- Machine Shop & Tool Repair Service, Oakville
- Machine Shop Equipment & Supplies, Oakville
- Machine Tool Repair & Rebuild, Oakville
- Machine Tools , Oakville
- Machinery And Equipment Manufacturers, Oakville
- Machinery Custom Design Manufacturers, Oakville
- Machinery Movers & Erectors, Oakville
- Machinery Repair & Rebuild, Oakville
- Machinery, Supplies & Equipment - Business Production Related, Oakville
- Machinery, Supplies & Equipment - Business Supplies Related, Oakville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Oakville
- Magazine & Newspaper Stands, Oakville - Dealers & Distributors
- Magazine Ads, Oakville - Periodical Advertising
- Magicians & Hypnotist Entertainers, Oakville
- Mailbox Rental Services, Oakville
- Mailing, Delivery & Courier Service, Oakville
- Maintenance, Cleaning & Sanitation, Oakville
- Major Appliances, Oakville - Household & Kitchen
- Malls & Shopping Centers, Oakville
- Management Consultants & Services, Oakville
- Management Training & Development, Oakville
- Manicurists & Pedicurists, Oakville
- Manufacturers Agents & Representatives, Oakville
- Manufacturers Representative, Oakville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Oakville
- Manufacturing & Industrial Consultants, Oakville
- Manufacturing Equipment & Supplies, Oakville
- Manufacturing Products, Oakville
- Manufacturing Services, Oakville
- Marble, Oakville
- Marinas & Marina Services, Oakville
- Marine & Boat Products, Oakville
- Marine & Lake Services, Oakville
- Marine Electronic Equipment, Oakville
- Marine Supplies & Equipment, Oakville - Boat Supplies
- Marine Surveyors & Adjustors, Oakville
- Market Research & Analysis , Oakville - Market Analysis, Business & Economic Research
- Marketing Schools, Oakville
- Marriage & Family Counselors, Oakville
- Martial Arts & Self Defense Schools, Oakville
- Masonry Contractors, Oakville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Oakville
- Massage Therapists & Professional, Oakville
- Massage Therapy, Oakville
- Massage Therapy Relaxation, Oakville
- Mastectomy Apparel, Forms, Prostheses & Supplies, Oakville
- Material Handling, Oakville
- Material Handling & Heavy Machinery & Equipment, Oakville
- Material Handling Equipment, Oakville - Conveyor Belt, Pallet Jack, Forklift, etc
- Mausoleums Developers, Oakville
- Maytag Appliances, Oakville
- Meat Brokers, Oakville
- Meat Market, Wholesale & Products, Oakville
- Meat Packers, Oakville
- Mechanical Contractors, Oakville - Install, Service & Repair
- Media Consultants, Oakville
- Medical & Health Service Organizations, Oakville
- Medical Equipment & Supplies Rental & Leasing, Oakville
- Medical Groups & Clinics, Oakville - Medical & Health Centers
- Medical Research Facilities, Oakville - Research & Development Centers
- Medical Supplies & Equipment, Oakville
- Mediterranean Restaurants, Oakville
- Meeting & Event Planning Services, Oakville - Conference Consultants
- Membership Sports & Recreation Clubs, Oakville
- Men's & Boys Clothing & Accessories Stores, Oakville
- Men's Clothing Stores, Oakville - Clothes & Accessories
- Men's Shoe Stores, Oakville
- Mens & Boys Belts & Suspenders, Oakville
- Mental Health Specialists, Oakville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Oakville
- Metal Buildings, Oakville - Kits, Homes, Steel Buildings, etc
- Metal Detecting Equipment, Oakville
- Metal Distributors, Oakville
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- Metal Heat Treating, Oakville
- Metal Pails, Drums & Barrel Manufacturers, Oakville
- Metal Pigment & Paint Products, Oakville
- Metal Plating & Polishing, Oakville
- Metal Products, Oakville
- Metal Repair Service & Blacksmith, Oakville - Iron Works
- Metal Services, Oakville
- Metal Stampings Manufacturers, Oakville
- Metal Tanks, Oakville
- Metal Working Machinery, Oakville
- Mexican Restaurants, Oakville
- Microfilm & Imaging Service, Equipment & Supplies , Oakville
- Midwives, Oakville
- Mildew Removal & Control, Oakville - Mold Removal
- Millwrights, Oakville
- Mineral Wool Manufacturers, Oakville
- Mini & Self Storage, Oakville
- Mini Golf Courses, Oakville
- Mining, Oakville
- Mining Consultants, Oakville
- Mining Development & Exploration, Oakville
- Mining Equipment & Supplies, Oakville
- Mining Services, Oakville
- Ministries Church, Oakville
- Mirrors, Oakville - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Oakville
- Miscellaneous Household Item Repair, Oakville
- Miscellaneous Agriculture, Oakville
- Miscellaneous Business Services, Oakville
- Miscellaneous Government, Oakville
- Miscellaneous Industry, Oakville
- Miscellaneous Manufacturing, Oakville
- Miscellaneous Metal Work Manufacturers, Oakville
- Miscellaneous Personal Services, Oakville
- Miscellaneous Photographers, Oakville
- Miscellaneous Professional, Oakville
- Mission Churches, Oakville
- Modular & Mobile Homes For Sale, Oakville - Manufactured Homes Sale & Service
- Modular Buildings, Oakville - Modular Homes Buildings & Offices
- Moldings Materials, Oakville
- Money Transfer Service, Oakville
- Monuments, Tombstones, Markers & Memorials, Oakville
- Mortgage Bankers & Correspondents, Oakville
- Mortgage Brokers, Oakville
- Motion Picture & Television Production Services, Oakville
- Motion Picture Dists & Producers, Oakville
- Motion Picture Equipment & Supplies, Oakville
- Motion Picture Pre & Post Production Services, Oakville
- Motivational Speakers & Consultants, Oakville - Speakers, Lectures & Seminars
- Motor Vehicle, Oakville
- Motor Vehicle Rental & Leasing, Oakville
- Motorcycle Parts, Accessories & Dealers, Oakville
- Motorcycles Bicycles & Parts, Oakville
- Movie Theaters, Oakville
- Moving Boxes & Supplies, Oakville
- Moving Companies, Oakville
- Moving Truck Rental , Oakville
- Muffler Shop & Exhaust Systems, Oakville
- Multimedia Publishers, Oakville - Multimedia Services & Systems
- Museums, Oakville
- Music, Oakville
- Music Entertainment, Oakville
- Music Lessons, Oakville
- Music Lessons - Instrumental, Oakville
- Music Lessons - Vocal, Oakville
- Music Publishers & Distribution, Oakville
- Music Schools, Oakville
- Music Sheet, Oakville
- Music Stores Retail, Oakville
- Musical Instruments & Equipment Stores, Oakville
- Musical Instruments Repair, Sales & Service, Oakville
- Musical Recording Services, Oakville
- Musicians, Bands & Disc Jockeys, Oakville
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