- Machine Shop, Madison
- Machinery Repair & Rebuild, Madison
- Machinery, Supplies & Equipment - Business Production Related, Madison
- Machinery, Supplies & Equipment - Business Supplies Related, Madison
- Machinery, Supplies & Equipment - Construction & Contractor Related, Madison
- Magazine Ads, Madison - Periodical Advertising
- Major Appliances, Madison - Household & Kitchen
- Management Consultants & Services, Madison
- Manicurists & Pedicurists, Madison
- Manufacturing, Madison
- Manufacturing Products, Madison
- Marine Supplies & Equipment, Madison - Boat Supplies
- Marriage & Family Counselors, Madison
- Martial Arts & Self Defense Schools, Madison
- Masonry Materials & Supplies, Madison
- Mass Transit Vehicle Dealers, Madison
- Massage Therapy, Madison
- Material Handling Equipment, Madison - Conveyor Belt, Pallet Jack, Forklift, etc
- Medical & Dental Assistant Schools, Madison
- Medical & Health Service Organizations, Madison
- Medical Billing Services, Madison
- Medical Equipment Manufacturers, Madison
- Medical Supplies & Equipment, Madison
- Meeting & Event Planning Services, Madison - Conference Consultants
- Membership Sports & Recreation Clubs, Madison
- Men's Clothing Stores, Madison - Clothes & Accessories
- Mental Health Clinics, Madison - Treatment Centers
- Merchandise Sales Events, Madison
- Merle Norman Cosmetics, Madison
- Metal Buildings, Madison - Kits, Homes, Steel Buildings, etc
- Metal Detecting Equipment, Madison
- Metal Finishers, Madison
- Metal Plating & Polishing, Madison
- Methodist Church, Madison
- Mexican Restaurants, Madison
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- Mini & Self Storage, Madison
- Mining, Madison
- Mining Equipment & Supplies, Madison
- Ministries Church, Madison
- Miscellaneous Business Product Repair, Madison
- Miscellaneous Household Item Repair, Madison
- Miscellaneous Agriculture, Madison
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Madison
- Miscellaneous Government, Madison
- Miscellaneous Manufacturing, Madison
- Miscellaneous Personal Services, Madison
- Miscellaneous Professional, Madison
- Mission Churches, Madison
- Mobile Home Parks & Communities , Madison
- Money Transfer Service, Madison
- Monuments, Tombstones, Markers & Memorials, Madison
- Mortgage Bankers & Correspondents, Madison
- Mortgages & Loans, Madison
- Motion Picture & Television Production Services, Madison
- Motor Sports, Madison
- Motor Vehicle, Madison
- Motor Vehicle Rental & Leasing, Madison
- Motorcycle & Motor Scooters Dealers, Repair & Service, Madison
- Motorcycle Parts, Accessories & Dealers, Madison
- Motorcycle Repair & Service, Madison
- Movie Theaters, Madison
- Moving Companies, Madison
- Moving Truck Rental , Madison
- Muffler Shop & Exhaust Systems, Madison
- Music, Madison
- Music Production Services, Madison
- Musical Instrument Manufacturers, Madison
- Musical Instruments & Equipment Stores, Madison
- Musical Instruments Repair, Sales & Service, Madison
- Musical Recording Services, Madison
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