- Machine Shop, Guelph
- Machine Shop & Tool Repair Service, Guelph
- Machine Tool Repair & Rebuild, Guelph
- Machinery And Equipment Manufacturers, Guelph
- Machinery Custom Design Manufacturers, Guelph
- Machinery Movers & Erectors, Guelph
- Machinery Repair & Rebuild, Guelph
- Machinery, Supplies & Equipment - Business Production Related, Guelph
- Machinery, Supplies & Equipment - Business Supplies Related, Guelph
- Machinery, Supplies & Equipment - Construction & Contractor Related, Guelph
- Magazine & Newspaper Stands, Guelph - Dealers & Distributors
- Magazine Ads, Guelph - Periodical Advertising
- Mailboxes Retail, Guelph
- Mailing, Delivery & Courier Service, Guelph
- Maintenance, Cleaning & Sanitation, Guelph
- Major Appliances, Guelph - Household & Kitchen
- Make Up & Cosmetics Application, Guelph
- Malls & Shopping Centers, Guelph
- Management Consultants & Services, Guelph
- Management Training & Development, Guelph
- Manicurists & Pedicurists, Guelph
- Manufacturers Agents & Representatives, Guelph
- Manufacturers Representative, Guelph - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Guelph
- Manufacturing Products, Guelph
- Manufacturing Services, Guelph
- Market Research & Analysis , Guelph - Market Analysis, Business & Economic Research
- Marketing Schools, Guelph
- Marriage & Family Counselors, Guelph
- Martial Arts & Self Defense Schools, Guelph
- Masonry Contractors, Guelph - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Guelph
- Massage Therapists & Professional, Guelph
- Massage Therapy, Guelph
- Mastectomy Apparel, Forms, Prostheses & Supplies, Guelph
- Meat Brokers, Guelph
- Meat Market, Wholesale & Products, Guelph
- Mechanical Contractors, Guelph - Install, Service & Repair
- Mechanical Floats, Guelph
- Medical & Health Service Organizations, Guelph
- Medical Equipment & Supplies Rental & Leasing, Guelph
- Medical Groups & Clinics, Guelph - Medical & Health Centers
- Medical Research Facilities, Guelph - Research & Development Centers
- Medical Supplies & Equipment, Guelph
- Meeting & Event Planning Services, Guelph - Conference Consultants
- Membership Sports & Recreation Clubs, Guelph
- Men's & Boys Clothing & Accessories Stores, Guelph
- Men's Clothing Stores, Guelph - Clothes & Accessories
- Men's Shoe Stores, Guelph
- Mens & Boys Hats, Gloves & Neckwear, Guelph
- Mental Health Specialists, Guelph - Psychologist, Psychiatrist, Psychotherapist, etc
- Messenger Service, Guelph - Message Receiving & Forwarding Service
- Metal Buildings, Guelph - Kits, Homes, Steel Buildings, etc
- Metal Coating & Allied Services, Guelph
- Metal Finishers, Guelph
- Metal Galvanizing, Guelph
- Metal Heat Treating, Guelph
- Metal Plating & Polishing, Guelph
- Metal Products, Guelph
- Metal Products, Guelph
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- Metal Repair Service & Blacksmith, Guelph - Iron Works
- Metal Roll Forming Manufacturers, Guelph
- Metal Specialties, Guelph
- Metal Stampings Manufacturers, Guelph
- Metaphysical Churches, Guelph
- Mexican Food, Guelph
- Mexican Restaurants, Guelph
- Middle Eastern Restaurants, Guelph
- Mildew Removal & Control, Guelph - Mold Removal
- Millwork Contractors, Guelph
- Millwrights, Guelph
- Minerals, Guelph
- Mini & Self Storage, Guelph
- Mirrors, Guelph - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Guelph
- Miscellaneous Household Item Repair, Guelph
- Miscellaneous Agriculture, Guelph
- Miscellaneous Business Services, Guelph
- Miscellaneous Government, Guelph
- Miscellaneous Industry, Guelph
- Miscellaneous Manufacturing, Guelph
- Miscellaneous Metal Work Manufacturers, Guelph
- Miscellaneous Personal Services, Guelph
- Miscellaneous Photographers, Guelph
- Miscellaneous Professional, Guelph
- Mission Churches, Guelph
- Mobile Home Parks & Communities , Guelph
- Mobile Homes, Guelph
- Mobile Homes Manufactures, Guelph
- Modular & Mobile Homes For Sale, Guelph - Manufactured Homes Sale & Service
- Modular Buildings, Guelph - Modular Homes Buildings & Offices
- Moldings Materials, Guelph
- Money Counting & Wrapping, Guelph
- Money Transfer Service, Guelph
- Monuments, Tombstones, Markers & Memorials, Guelph
- Mortgage Bankers & Correspondents, Guelph
- Mortgage Brokers, Guelph
- Mortgage Companies, Guelph
- Motion Picture & Television Production Services, Guelph
- Motion Picture Pre & Post Production Services, Guelph
- Motor Vehicle, Guelph
- Motor Vehicle Rental & Leasing, Guelph
- Motorcycle Parts, Accessories & Dealers, Guelph
- Motorcycle Wreckers, Guelph
- Motorcycles Bicycles & Parts, Guelph
- Mountain & Ice Climbing Tours, Guelph
- Movie Theaters, Guelph
- Moving Companies, Guelph
- Moving Supplies & Equipment Rental, Guelph
- Moving Truck Rental , Guelph
- Muffler Shop & Exhaust Systems, Guelph
- Multimedia Publishers, Guelph - Multimedia Services & Systems
- Museums, Guelph
- Music, Guelph
- Music Lessons, Guelph
- Music Lessons - Instrumental, Guelph
- Music Lessons - Vocal, Guelph
- Musical Instruments & Equipment Stores, Guelph
- Musical Instruments Repair, Sales & Service, Guelph
- Musical Recording Services, Guelph
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