- Machine Shop & Tool Repair Service, Frederick
- Machinery, Supplies & Equipment - Business Supplies Related, Frederick
- Major Appliances, Frederick - Household & Kitchen
- Management Consultants & Services, Frederick
- Manufacturing, Frederick
- Manufacturing Products, Frederick
- Marriage & Family Counselors, Frederick
- Masonry Materials & Supplies, Frederick
- Meat Market, Wholesale & Products, Frederick
- Membership Sports & Recreation Clubs, Frederick
- Mental Health Specialists, Frederick - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Frederick
- Mexican Restaurants, Frederick
- Mini & Self Storage, Frederick
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- Miscellaneous Business Services, Frederick
- Miscellaneous Government, Frederick
- Miscellaneous Personal Services, Frederick
- Miscellaneous Photographers, Frederick
- Miscellaneous Professional, Frederick
- Mission Churches, Frederick
- Monuments, Tombstones, Markers & Memorials, Frederick
- Mortgage Bankers & Correspondents, Frederick
- Mortgage Contracts & Services, Frederick
- Motor Vehicle, Frederick
- Motor Vehicle Rental & Leasing, Frederick
- Moving Supplies & Equipment Rental, Frederick
- Moving Truck Rental , Frederick
- Museums, Frederick
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