- Machine Shop & Tool Repair Service, Brockville
- Machinery And Equipment Manufacturers, Brockville
- Machinery, Supplies & Equipment - Business Production Related, Brockville
- Machinery, Supplies & Equipment - Business Supplies Related, Brockville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Brockville
- Magazine & Newspaper Stands, Brockville - Dealers & Distributors
- Mailing, Delivery & Courier Service, Brockville
- Maintenance, Cleaning & Sanitation, Brockville
- Major Appliances, Brockville - Household & Kitchen
- Malls & Shopping Centers, Brockville
- Management Consultants & Services, Brockville
- Management Training & Development, Brockville
- Manicurists & Pedicurists, Brockville
- Manufacturers Agents & Representatives, Brockville
- Manufacturers Representative, Brockville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Brockville
- Manufacturing Products, Brockville
- Map Publishers & Printers, Brockville
- Mapping & Topographical Services, Brockville
- Marinas & Marina Services, Brockville
- Marine & Boat Products, Brockville
- Marriage & Family Counselors, Brockville
- Martial Arts & Self Defense Schools, Brockville
- Masonry Contractors, Brockville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Brockville
- Massage Therapists & Professional, Brockville
- Massage Therapy, Brockville
- Material Handling Equipment, Brockville - Conveyor Belt, Pallet Jack, Forklift, etc
- Mechanical Contractors, Brockville - Install, Service & Repair
- Medical Identification Jewelry, Brockville
- Medical Supplies & Equipment, Brockville
- Membership Sports & Recreation Clubs, Brockville
- Men's Clothing Stores, Brockville - Clothes & Accessories
- Mens & Womens Clothing, Brockville
- Mental Health Specialists, Brockville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Brockville
- Metal Repair Service & Blacksmith, Brockville - Iron Works
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- Mexican Restaurants, Brockville
- Military Supplies, Brockville
- Mini & Self Storage, Brockville
- Mini Golf Courses, Brockville
- Mining, Brockville
- Mining Equipment & Supplies, Brockville
- Mirrors, Brockville - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Brockville
- Miscellaneous Agriculture, Brockville
- Miscellaneous Business Services, Brockville
- Miscellaneous Government, Brockville
- Miscellaneous Industry, Brockville
- Miscellaneous Manufacturing, Brockville
- Miscellaneous Personal Services, Brockville
- Miscellaneous Photographers, Brockville
- Miscellaneous Professional, Brockville
- Modeling & Talent Agencies, Brockville
- Money Transfer Service, Brockville
- Monuments, Tombstones, Markers & Memorials, Brockville
- Mortgage Bankers & Correspondents, Brockville
- Mortgage Brokers, Brockville
- Motor Vehicle, Brockville
- Motor Vehicle Rental & Leasing, Brockville
- Motorcycle Parts, Accessories & Dealers, Brockville
- Moving Companies, Brockville
- Moving Truck Rental , Brockville
- Muffler Shop & Exhaust Systems, Brockville
- Museums, Brockville
- Music, Brockville
- Music Entertainment, Brockville
- Music Lessons, Brockville
- Music Lessons - Instrumental, Brockville
- Music Sheet, Brockville
- Music Stores Retail, Brockville
- Musical Instruments & Equipment Stores, Brockville
- Musicians, Bands & Disc Jockeys, Brockville
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