- Machine Shop, Madison
- Machinery Movers & Erectors, Madison
- Machinery, Supplies & Equipment - Business Production Related, Madison
- Machinery, Supplies & Equipment - Construction & Contractor Related, Madison
- Maintenance, Cleaning & Sanitation, Madison
- Management Consultants & Services, Madison
- Manicurists & Pedicurists, Madison
- Manufactured & Mobile Home Movers & Transporting, Madison
- Manufacturing, Madison
- Manufacturing Products, Madison
- Masonry Materials & Supplies, Madison
- Medical Supplies & Equipment, Madison
- Membership Sports & Recreation Clubs, Madison
- Men's Clothing Stores, Madison - Clothes & Accessories
- Mental Health Specialists, Madison - Psychologist, Psychiatrist, Psychotherapist, etc
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- Merchandise Sales Events, Madison
- Metal Finishers, Madison
- Metal Plating & Polishing, Madison
- Mexican Restaurants, Madison
- Mildew Removal & Control, Madison - Mold Removal
- Miscellaneous Government, Madison
- Miscellaneous Personal Services, Madison
- Miscellaneous Professional, Madison
- Mission Churches, Madison
- Modular & Mobile Homes For Sale, Madison - Manufactured Homes Sale & Service
- Motor Vehicle, Madison
- Motor Vehicle Rental & Leasing, Madison
- Moving Truck Rental , Madison
- Museums, Madison
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