- Machine Shop, Thomson
- Machine Shop & Tool Repair Service, Thomson
- Machinery, Supplies & Equipment - Business Supplies Related, Thomson
- Maintenance, Cleaning & Sanitation, Thomson
- Major Appliances, Thomson - Household & Kitchen
- Management Consultants & Services, Thomson
- Manicurists & Pedicurists, Thomson
- Manufacturing, Thomson
- Marinas & Marina Services, Thomson
- Marriage & Family Counselors, Thomson
- Masonry Materials & Supplies, Thomson
- Meat Packers, Thomson
- Medical & Health Service Organizations, Thomson
- Meeting & Event Planning Services, Thomson - Conference Consultants
- Mental Health Specialists, Thomson - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Thomson
- Merle Norman Cosmetics, Thomson
- Metals Base, Thomson
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- Methodist Church, Thomson
- Mexican Restaurants, Thomson
- Microwave Communications, Thomson
- Mildew Removal & Control, Thomson - Mold Removal
- Ministries Church, Thomson
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Thomson
- Miscellaneous Government, Thomson
- Miscellaneous Professional, Thomson
- Mortgage Bankers & Correspondents, Thomson
- Motor Vehicle, Thomson
- Motor Vehicle Rental & Leasing, Thomson
- Motorcycle Parts, Accessories & Dealers, Thomson
- Movie Theaters, Thomson
- Moving & Storage Supplies & Equipment, Thomson
- Moving Companies, Thomson
- Moving Truck Rental , Thomson
- Muffler Shop & Exhaust Systems, Thomson
- Museums, Thomson
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