- Machine Shop, Barrie
- Machine Shop & Tool Repair Service, Barrie
- Machine Shops Slings, Barrie
- Machine Tools , Barrie
- Machinery And Equipment Manufacturers, Barrie
- Machinery Custom Design Manufacturers, Barrie
- Machinery Movers & Erectors, Barrie
- Machinery, Supplies & Equipment - Business Production Related, Barrie
- Machinery, Supplies & Equipment - Business Supplies Related, Barrie
- Machinery, Supplies & Equipment - Construction & Contractor Related, Barrie
- Magazine & Newspaper Stands, Barrie - Dealers & Distributors
- Mailbox Rental Services, Barrie
- Mailboxes Retail, Barrie
- Mailing, Delivery & Courier Service, Barrie
- Maintenance, Cleaning & Sanitation, Barrie
- Major Appliances, Barrie - Household & Kitchen
- Malls & Shopping Centers, Barrie
- Malpractice Attorneys & Lawyers, Barrie
- Malpractice Attorneys & Lawyers, Barrie
- Malpractice Lawyers & Attorneys, Barrie
- Management Consultants & Services, Barrie
- Management Training & Development, Barrie
- Manicurists & Pedicurists, Barrie
- Manufacturers Agents & Representatives, Barrie
- Manufacturers Representative, Barrie - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Barrie
- Manufacturing & Industrial Consultants, Barrie
- Manufacturing Products, Barrie
- Marble, Barrie
- Marinas & Marina Services, Barrie
- Marine Electronic Equipment, Barrie
- Marine Products And Services, Barrie
- Marine Repair & Service Stations, Barrie
- Marine Services, Barrie
- Marine Supplies & Equipment, Barrie - Boat Supplies
- Marine Supplies & Equipment Repair, Barrie - Boat Supplies & Equipment
- Marine Surveyors & Adjustors, Barrie
- Market Research & Analysis , Barrie - Market Analysis, Business & Economic Research
- Marketing Schools, Barrie
- Marriage & Family Counselors, Barrie
- Martial Arts & Self Defense Schools, Barrie
- Masonry Contractors, Barrie - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Barrie
- Massage Therapists & Professional, Barrie
- Massage Therapy, Barrie
- Massage Therapy Relaxation, Barrie
- Mastectomy Apparel, Forms, Prostheses & Supplies, Barrie
- Maternity Clothes & Clothing Stores, Barrie - Maternity Dress, Gown, Swimwear, Underwear & More
- Mats & Matting, Barrie
- Maytag Appliances, Barrie
- Meat Market, Wholesale & Products, Barrie
- Mechanical Contractors, Barrie - Install, Service & Repair
- Mechanical Floats, Barrie
- Medical & Health Service Organizations, Barrie
- Medical Alert Systems, Barrie - Medical Alarms - PERS
- Medical Groups & Clinics, Barrie - Medical & Health Centers
- Medical Research Facilities, Barrie - Research & Development Centers
- Medical Supplies & Equipment, Barrie
- Meeting & Event Planning Services, Barrie - Conference Consultants
- Membership Sports & Recreation Clubs, Barrie
- Men's & Boys Clothing & Accessories Stores, Barrie
- Men's Clothing Stores, Barrie - Clothes & Accessories
- Men's Shoe Stores, Barrie
- Mens & Boys Jeans & Western Wear Stores, Barrie
- Mens & Womens Clothing, Barrie
- Mental Health Specialists, Barrie - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Barrie
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- Metal Buildings, Barrie - Kits, Homes, Steel Buildings, etc
- Metal Plating & Polishing, Barrie
- Metal Products, Barrie
- Metal Repair Service & Blacksmith, Barrie - Iron Works
- Metal Services, Barrie
- Metal Stampings Manufacturers, Barrie
- Metal Working Machinery, Barrie
- Methodist Church, Barrie
- Mexican Restaurants, Barrie
- Middle Eastern Restaurants, Barrie
- Midwives, Barrie
- Mildew Removal & Control, Barrie - Mold Removal
- Millwork Contractors, Barrie
- Millwrights, Barrie
- Mineral Wool Manufacturers, Barrie
- Mini & Self Storage, Barrie
- Mini Golf Courses, Barrie
- Mining, Barrie
- Mining Equipment & Supplies, Barrie
- Mirrors, Barrie - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Barrie
- Miscellaneous Household Item Repair, Barrie
- Miscellaneous Prosthesis & Appliances, Barrie
- Miscellaneous Agriculture, Barrie
- Miscellaneous Business Services, Barrie
- Miscellaneous Government, Barrie
- Miscellaneous Industry, Barrie
- Miscellaneous Manufacturing, Barrie
- Miscellaneous Metal Work Manufacturers, Barrie
- Miscellaneous Personal Services, Barrie
- Miscellaneous Photographers, Barrie
- Miscellaneous Professional, Barrie
- Mission Churches, Barrie
- Mobile Home Parks & Communities , Barrie
- Modeling & Talent Agencies, Barrie
- Modular & Mobile Homes For Sale, Barrie - Manufactured Homes Sale & Service
- Moldings Materials, Barrie
- Molds Manufacturers, Barrie
- Money Transfer Service, Barrie
- Monuments, Tombstones, Markers & Memorials, Barrie
- Mortgage Bankers & Correspondents, Barrie
- Mortgage Brokers, Barrie
- Motion Picture & Television Production Services, Barrie
- Motion Picture Dists & Producers, Barrie
- Motion Picture Pre & Post Production Services, Barrie
- Motivational & Self Improvement Schools, Barrie
- Motor Vehicle, Barrie
- Motor Vehicle Rental & Leasing, Barrie
- Motorcycle Parts, Accessories & Dealers, Barrie
- Motorcycle Repair & Service, Barrie
- Motorcycles Paint & Refinishing, Barrie
- Movie Theaters, Barrie
- Moving & Storage Supplies & Equipment, Barrie
- Moving Companies, Barrie
- Moving Truck Rental , Barrie
- Muffler Shop & Exhaust Systems, Barrie
- Multimedia Publishers, Barrie - Multimedia Services & Systems
- Murals & Faux Finish Walls, Barrie
- Museums, Barrie
- Music, Barrie
- Music Lessons, Barrie
- Music Lessons - Instrumental, Barrie
- Music Lessons - Vocal, Barrie
- Music Schools, Barrie
- Musical Instruments & Equipment Stores, Barrie
- Musical Instruments Repair, Sales & Service, Barrie
- Musical Recording Services, Barrie
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