- Machine Shop & Tool Repair Service, South Lyon
- Machinery, Supplies & Equipment - Business Supplies Related, South Lyon
- Mailing List Service, Brokers & Compilers, South Lyon
- Management Consultants & Services, South Lyon
- Manicurists & Pedicurists, South Lyon
- Manufacturers Agents & Representatives, South Lyon
- Manufacturers Representative, South Lyon - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, South Lyon
- Manufacturing Products, South Lyon
- Marriage & Family Counselors, South Lyon
- Martial Arts & Self Defense Schools, South Lyon
- Masonry Contractors, South Lyon - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, South Lyon
- Medical & Infectious Waste Disposal, South Lyon
- Medical Billing Services, South Lyon
- Medical Diagnostic Clinics, South Lyon - Clinical Labs & Centers
- Medical Equipment Manufacturers, South Lyon
- Medical Supplies & Equipment, South Lyon
- Membership Sports & Recreation Clubs, South Lyon
- Mental Health Specialists, South Lyon - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, South Lyon
- Metal Distributors, South Lyon
- Metal Repair Service & Blacksmith, South Lyon - Iron Works
- Methodist Church, South Lyon
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- Mexican Restaurants, South Lyon
- Mini Golf Courses, South Lyon
- Mirrors, South Lyon - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, South Lyon
- Miscellaneous Household Item Repair, South Lyon
- Miscellaneous Agriculture, South Lyon
- Miscellaneous Government, South Lyon
- Miscellaneous Manufacturing, South Lyon
- Miscellaneous Personal Services, South Lyon
- Miscellaneous Photographers, South Lyon
- Miscellaneous Professional, South Lyon
- Mobile Home Parks & Communities , South Lyon
- Modular & Mobile Homes For Sale, South Lyon - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, South Lyon
- Mortgage Bankers & Correspondents, South Lyon
- Motor Vehicle, South Lyon
- Motor Vehicle Rental & Leasing, South Lyon
- Motorcycle & Motor Scooters Dealers, Repair & Service, South Lyon
- Motorcycle Repair & Service, South Lyon
- Moving Companies, South Lyon
- Moving Truck Rental , South Lyon
- Muffler Shop & Exhaust Systems, South Lyon
- Museums, South Lyon
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