- Machine Shop, Port Perry
- Machine Shop & Tool Repair Service, Port Perry
- Machinery, Supplies & Equipment - Business Production Related, Port Perry
- Machinery, Supplies & Equipment - Business Supplies Related, Port Perry
- Machinery, Supplies & Equipment - Construction & Contractor Related, Port Perry
- Magazine & Newspaper Stands, Port Perry - Dealers & Distributors
- Maintenance, Cleaning & Sanitation, Port Perry
- Major Appliances, Port Perry - Household & Kitchen
- Management Consultants & Services, Port Perry
- Management Training & Development, Port Perry
- Manicurists & Pedicurists, Port Perry
- Manufacturers Agents & Representatives, Port Perry
- Manufacturers Representative, Port Perry - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Port Perry
- Manufacturing Products, Port Perry
- Marinas & Marina Services, Port Perry
- Marine Supplies & Equipment, Port Perry - Boat Supplies
- Marriage & Family Counselors, Port Perry
- Martial Arts & Self Defense Schools, Port Perry
- Masonry Contractors, Port Perry - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Port Perry
- Massage Therapists & Professional, Port Perry
- Massage Therapy, Port Perry
- Meat Packers, Port Perry
- Mechanical Contractors, Port Perry - Install, Service & Repair
- Medical Supplies & Equipment, Port Perry
- Meeting & Event Planning Services, Port Perry - Conference Consultants
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- Membership Sports & Recreation Clubs, Port Perry
- Mental Health Specialists, Port Perry - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Port Perry
- Metal Repair Service & Blacksmith, Port Perry - Iron Works
- Mexican Restaurants, Port Perry
- Micro Breweries, Port Perry
- Mini & Self Storage, Port Perry
- Miscellaneous Agriculture, Port Perry
- Miscellaneous Government, Port Perry
- Miscellaneous Manufacturing, Port Perry
- Miscellaneous Personal Services, Port Perry
- Miscellaneous Photographers, Port Perry
- Miscellaneous Professional, Port Perry
- Money Transfer Service, Port Perry
- Monuments, Tombstones, Markers & Memorials, Port Perry
- Mortgage Bankers & Correspondents, Port Perry
- Mortgage Brokers, Port Perry
- Motivational Speakers & Consultants, Port Perry - Speakers, Lectures & Seminars
- Motor Vehicle, Port Perry
- Motor Vehicle Rental & Leasing, Port Perry
- Motorcycle Parts, Accessories & Dealers, Port Perry
- Movie Theaters, Port Perry
- Moving & Storage Supplies & Equipment, Port Perry
- Moving Companies, Port Perry
- Moving Truck Rental , Port Perry
- Muffler Shop & Exhaust Systems, Port Perry
- Museums, Port Perry
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