- Machine Shop, Sarnia
- Machine Shop & Tool Repair Service, Sarnia
- Machinery And Equipment Manufacturers, Sarnia
- Machinery Movers & Erectors, Sarnia
- Machinery, Supplies & Equipment - Business Production Related, Sarnia
- Machinery, Supplies & Equipment - Business Supplies Related, Sarnia
- Machinery, Supplies & Equipment - Construction & Contractor Related, Sarnia
- Magazine & Newspaper Stands, Sarnia - Dealers & Distributors
- Magnetic Devices, Sarnia
- Magnets & Magnetic Devices, Sarnia
- Mail Delivery Service, Sarnia
- Mailing, Delivery & Courier Service, Sarnia
- Maintenance, Cleaning & Sanitation, Sarnia
- Major Appliances, Sarnia - Household & Kitchen
- Malls & Shopping Centers, Sarnia
- Management Consultants & Services, Sarnia
- Management Training & Development, Sarnia
- Manicurists & Pedicurists, Sarnia
- Manufacturing, Sarnia
- Manufacturing & Industrial Consultants, Sarnia
- Manufacturing Equipment & Supplies, Sarnia
- Manufacturing Products, Sarnia
- Marinas & Marina Services, Sarnia
- Marine Contractors & Designers, Sarnia
- Marine Electronic Equipment, Sarnia
- Marine Supplies & Equipment, Sarnia - Boat Supplies
- Marriage & Family Counselors, Sarnia
- Martial Arts & Self Defense Schools, Sarnia
- Mary Kay Cosmetics, Sarnia
- Masonry Contractors, Sarnia - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Sarnia
- Massage Parlor & Steam Bath Services, Sarnia
- Massage Therapists & Professional, Sarnia
- Massage Therapy, Sarnia
- Massage Therapy Relaxation, Sarnia
- Mastectomy Apparel, Forms, Prostheses & Supplies, Sarnia
- Maternity Clothes & Clothing Stores, Sarnia - Maternity Dress, Gown, Swimwear, Underwear & More
- Mats & Matting, Sarnia
- Mechanical Contractors, Sarnia - Install, Service & Repair
- Mechanical Seals, Sarnia
- Medical Alert Systems, Sarnia - Medical Alarms - PERS
- Medical Research Facilities, Sarnia - Research & Development Centers
- Medical Supplies & Equipment, Sarnia
- Meeting & Event Planning Services, Sarnia - Conference Consultants
- Membership Sports & Recreation Clubs, Sarnia
- Men's & Boys Clothing & Accessories Stores, Sarnia
- Men's Clothing Stores, Sarnia - Clothes & Accessories
- Men's Shoe Stores, Sarnia
- Mens & Boys Jeans & Western Wear Stores, Sarnia
- Mens & Womens Clothing, Sarnia
- Mental Health Specialists, Sarnia - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Sarnia
- Metal Buildings, Sarnia - Kits, Homes, Steel Buildings, etc
- Metal Coating & Allied Services, Sarnia
- Metal Heat Treating, Sarnia
- Metal Repair Service & Blacksmith, Sarnia - Iron Works
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- Metal Tanks, Sarnia
- Metal Working Machinery, Sarnia
- Methodist Church, Sarnia
- Mexican Restaurants, Sarnia
- Michelin Tires, Sarnia - Dealers
- Middle Eastern Restaurants, Sarnia
- Midwives, Sarnia
- Mildew Removal & Control, Sarnia - Mold Removal
- Millwrights, Sarnia
- Mineral Wool Manufacturers, Sarnia
- Mini & Self Storage, Sarnia
- Mining, Sarnia
- Mirrors, Sarnia - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Sarnia
- Miscellaneous Agriculture, Sarnia
- Miscellaneous Business Services, Sarnia
- Miscellaneous Government, Sarnia
- Miscellaneous Industry, Sarnia
- Miscellaneous Manufacturing, Sarnia
- Miscellaneous Personal Services, Sarnia
- Miscellaneous Photographers, Sarnia
- Miscellaneous Professional, Sarnia
- Mission Churches, Sarnia
- Mobile Home Parks & Communities , Sarnia
- Modular Buildings, Sarnia - Modular Homes Buildings & Offices
- Money Transfer Service, Sarnia
- Monuments, Tombstones, Markers & Memorials, Sarnia
- Mortgage Bankers & Correspondents, Sarnia
- Mortgage Brokers, Sarnia
- Mortgage Companies, Sarnia
- Mosques, Sarnia
- Motion Picture Pre & Post Production Services, Sarnia
- Motion Pictures Video Tape Duplication & Transfer Services, Sarnia
- Motor Vehicle, Sarnia
- Motor Vehicle Rental & Leasing, Sarnia
- Motorcycle Parts, Accessories & Dealers, Sarnia
- Motorcycle Wreckers, Sarnia
- Mountain & Ice Climbing Tours, Sarnia
- Movie Theaters, Sarnia
- Moving Companies, Sarnia
- Moving Supplies & Equipment Rental, Sarnia
- Moving Truck Rental , Sarnia
- Muffler Shop & Exhaust Systems, Sarnia
- Museums, Sarnia
- Music, Sarnia
- Music Entertainment, Sarnia
- Music Lessons, Sarnia
- Music Lessons - Instrumental, Sarnia
- Music Lessons - Vocal, Sarnia
- Music Sheet, Sarnia
- Music Stores Retail, Sarnia
- Musical Instruments & Equipment Stores, Sarnia
- Musical Instruments Repair, Sales & Service, Sarnia
- Musical Recording Services, Sarnia
- Muslim Church, Sarnia
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