- Machine Shop & Tool Repair Service, Frostburg
- Machinery, Supplies & Equipment - Business Supplies Related, Frostburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Frostburg
- Mail Delivery Service, Frostburg
- Management Consultants & Services, Frostburg
- Manicurists & Pedicurists, Frostburg
- Manufacturing, Frostburg
- Manufacturing & Industrial Consultants, Frostburg
- Martial Arts & Self Defense Schools, Frostburg
- Meat Market, Wholesale & Products, Frostburg
- Men's Clothing Stores, Frostburg - Clothes & Accessories
- Methodist Church, Frostburg
- Mining, Frostburg
- Mining Services, Frostburg
- Ministries Church, Frostburg
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- Miscellaneous Household Item Repair, Frostburg
- Miscellaneous Government, Frostburg
- Miscellaneous Personal Services, Frostburg
- Miscellaneous Photographers, Frostburg
- Monuments, Tombstones, Markers & Memorials, Frostburg
- Mortgages & Loans, Frostburg
- Motor Vehicle, Frostburg
- Motor Vehicle Rental & Leasing, Frostburg
- Movie Theaters, Frostburg
- Moving Companies, Frostburg
- Moving Truck Rental , Frostburg
- Muffler Shop & Exhaust Systems, Frostburg
- Museums, Frostburg
- Music, Frostburg
- Musical Instruments & Equipment Stores, Frostburg
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