- Machine Shop & Tool Repair Service, Summerside
- Machinery Repair & Rebuild, Summerside
- Machinery, Supplies & Equipment - Business Production Related, Summerside
- Machinery, Supplies & Equipment - Business Supplies Related, Summerside
- Machinery, Supplies & Equipment - Construction & Contractor Related, Summerside
- Magazine & Newspaper Stands, Summerside - Dealers & Distributors
- Major Appliances, Summerside - Household & Kitchen
- Malls & Shopping Centers, Summerside
- Management Consultants & Services, Summerside
- Manicurists & Pedicurists, Summerside
- Manufacturing, Summerside
- Manufacturing Equipment & Supplies, Summerside
- Manufacturing Products, Summerside
- Marine Contractors & Designers, Summerside
- Marine Electronic Equipment, Summerside
- Marine Supplies & Equipment, Summerside - Boat Supplies
- Marriage & Family Counselors, Summerside
- Martial Arts & Self Defense Schools, Summerside
- Masonry Contractors, Summerside - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Summerside
- Massage Therapists & Professional, Summerside
- Massage Therapy, Summerside
- Material Handling & Heavy Machinery & Equipment, Summerside
- Medical Supplies & Equipment, Summerside
- Membership Sports & Recreation Clubs, Summerside
- Men's Clothing Stores, Summerside - Clothes & Accessories
- Mens & Womens Clothing, Summerside
- Mental Health Specialists, Summerside - Psychologist, Psychiatrist, Psychotherapist, etc
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- Metal Buildings, Summerside - Kits, Homes, Steel Buildings, etc
- Mexican Restaurants, Summerside
- Mini & Self Storage, Summerside
- Miscellaneous Agriculture, Summerside
- Miscellaneous Business Services, Summerside
- Miscellaneous Government, Summerside
- Miscellaneous Industry, Summerside
- Miscellaneous Personal Services, Summerside
- Miscellaneous Professional, Summerside
- Mobile Home Parks & Communities , Summerside
- Monuments, Tombstones, Markers & Memorials, Summerside
- Mortgage Bankers & Correspondents, Summerside
- Mortgage Brokers, Summerside
- Mortgage Companies, Summerside
- Motion Picture Pre & Post Production Services, Summerside
- Motor Vehicle, Summerside
- Motor Vehicle Rental & Leasing, Summerside
- Motorcycle Parts, Accessories & Dealers, Summerside
- Movie Theaters, Summerside
- Moving Companies, Summerside
- Moving Truck Rental , Summerside
- Muffler Shop & Exhaust Systems, Summerside
- Mulch, Peat & Moss Products, Summerside
- Museums, Summerside
- Music, Summerside
- Music Lessons, Summerside
- Music Lessons - Instrumental, Summerside
- Musical Instruments & Equipment Stores, Summerside
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