- Machine Shop & Tool Repair Service, Charlottetown
- Machine Tools , Charlottetown
- Machinery And Equipment Manufacturers, Charlottetown
- Machinery, Supplies & Equipment - Business Production Related, Charlottetown
- Machinery, Supplies & Equipment - Business Supplies Related, Charlottetown
- Machinery, Supplies & Equipment - Construction & Contractor Related, Charlottetown
- Magazine & Newspaper Stands, Charlottetown - Dealers & Distributors
- Magazine Ads, Charlottetown - Periodical Advertising
- Mailing List Service, Brokers & Compilers, Charlottetown
- Mailing, Delivery & Courier Service, Charlottetown
- Maintenance, Cleaning & Sanitation, Charlottetown
- Major Appliances, Charlottetown - Household & Kitchen
- Make Up & Cosmetics Application, Charlottetown
- Malls & Shopping Centers, Charlottetown
- Management Consultants & Services, Charlottetown
- Manicurists & Pedicurists, Charlottetown
- Manufactured & Mobile Home Movers & Transporting, Charlottetown
- Manufacturing, Charlottetown
- Manufacturing Products, Charlottetown
- Marinas & Marina Services, Charlottetown
- Marine Contractors & Designers, Charlottetown
- Marine Engineers, Charlottetown
- Marine Supplies & Equipment, Charlottetown - Boat Supplies
- Marine Surveyors & Adjustors, Charlottetown
- Market Research & Analysis , Charlottetown - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Charlottetown
- Martial Arts & Self Defense Schools, Charlottetown
- Masonry Contractors, Charlottetown - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Charlottetown
- Massage Therapists & Professional, Charlottetown
- Massage Therapy, Charlottetown
- Mastectomy Apparel, Forms, Prostheses & Supplies, Charlottetown
- Meat Brokers, Charlottetown
- Meat Market, Wholesale & Products, Charlottetown
- Meat Packers, Charlottetown
- Mechanical Contractors, Charlottetown - Install, Service & Repair
- Mechanical Engineer, Charlottetown - Mechanical Engineering Service
- Medical Alert Systems, Charlottetown - Medical Alarms - PERS
- Medical Research Facilities, Charlottetown - Research & Development Centers
- Medical Supplies & Equipment, Charlottetown
- Medical Transcription Service, Charlottetown
- Membership Sports & Recreation Clubs, Charlottetown
- Men's Clothing Stores, Charlottetown - Clothes & Accessories
- Men's Shoe Stores, Charlottetown
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- Mental Health Specialists, Charlottetown - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Charlottetown
- Metal Buildings, Charlottetown - Kits, Homes, Steel Buildings, etc
- Metal Products, Charlottetown
- Metal Repair Service & Blacksmith, Charlottetown - Iron Works
- Mildew Removal & Control, Charlottetown - Mold Removal
- Mini & Self Storage, Charlottetown
- Mining, Charlottetown
- Mirrors, Charlottetown - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Charlottetown
- Miscellaneous Agriculture, Charlottetown
- Miscellaneous Business Services, Charlottetown
- Miscellaneous Government, Charlottetown
- Miscellaneous Industry, Charlottetown
- Miscellaneous Manufacturing, Charlottetown
- Miscellaneous Personal Services, Charlottetown
- Miscellaneous Professional, Charlottetown
- Modular & Mobile Homes For Sale, Charlottetown - Manufactured Homes Sale & Service
- Money Transfer Service, Charlottetown
- Monuments, Tombstones, Markers & Memorials, Charlottetown
- Mortgage Bankers & Correspondents, Charlottetown
- Mortgage Brokers, Charlottetown
- Mortgage Companies, Charlottetown
- Mosquito Control, Charlottetown
- Motion Picture Pre & Post Production Services, Charlottetown
- Motivational & Self Improvement Schools, Charlottetown
- Motor Vehicle, Charlottetown
- Motor Vehicle Rental & Leasing, Charlottetown
- Motorcycle Parts, Accessories & Dealers, Charlottetown
- Movie Theaters, Charlottetown
- Moving Companies, Charlottetown
- Moving Truck Rental , Charlottetown
- Muffler Shop & Exhaust Systems, Charlottetown
- Multi Service Charitable & Non-Profit Organizations, Charlottetown
- Museums, Charlottetown
- Music, Charlottetown
- Music Background Leased, Charlottetown
- Music Entertainment, Charlottetown
- Music Lessons, Charlottetown
- Music Lessons - Instrumental, Charlottetown
- Musical Instruments & Equipment Stores, Charlottetown
- Musical Instruments Repair, Sales & Service, Charlottetown
- Musical Recording Services, Charlottetown
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