- Machine Shop, Port Elgin
- Machinery And Equipment Manufacturers, Port Elgin
- Machinery Movers & Erectors, Port Elgin
- Machinery Repair & Rebuild, Port Elgin
- Machinery, Supplies & Equipment - Business Supplies Related, Port Elgin
- Machinery, Supplies & Equipment - Construction & Contractor Related, Port Elgin
- Magazine & Newspaper Stands, Port Elgin - Dealers & Distributors
- Mailing, Delivery & Courier Service, Port Elgin
- Mandarin Restaurants, Port Elgin
- Manufacturing, Port Elgin
- Marinas & Marina Services, Port Elgin
- Marriage & Family Counselors, Port Elgin
- Martial Arts & Self Defense Schools, Port Elgin
- Masonry Contractors, Port Elgin - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Port Elgin
- Massage Therapists & Professional, Port Elgin
- Massage Therapy, Port Elgin
- Medical Supplies & Equipment, Port Elgin
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- Membership Sports & Recreation Clubs, Port Elgin
- Men's Clothing Stores, Port Elgin - Clothes & Accessories
- Mens & Womens Clothing, Port Elgin
- Merchandise Sales Events, Port Elgin
- Mini & Self Storage, Port Elgin
- Mini Golf Courses, Port Elgin
- Miscellaneous Government, Port Elgin
- Miscellaneous Manufacturing, Port Elgin
- Miscellaneous Personal Services, Port Elgin
- Miscellaneous Professional, Port Elgin
- Mission Churches, Port Elgin
- Mortgage Bankers & Correspondents, Port Elgin
- Mortgage Brokers, Port Elgin
- Motor Vehicle, Port Elgin
- Motor Vehicle Rental & Leasing, Port Elgin
- Motorcycle Parts, Accessories & Dealers, Port Elgin
- Moving Companies, Port Elgin
- Moving Truck Rental , Port Elgin
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