- Machine Shop & Tool Repair Service, Thurmont
- Machinery, Supplies & Equipment - Business Production Related, Thurmont
- Machinery, Supplies & Equipment - Business Supplies Related, Thurmont
- Mail Delivery Service, Thurmont
- Major Appliances, Thurmont - Household & Kitchen
- Manicurists & Pedicurists, Thurmont
- Manufacturing, Thurmont
- Martial Arts & Self Defense Schools, Thurmont
- Masonry Contractors, Thurmont - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Thurmont
- Material Handling & Heavy Machinery & Equipment, Thurmont
- Meat Market, Wholesale & Products, Thurmont
- Meat Packers, Thurmont
- Medical Diagnostic Clinics, Thurmont - Clinical Labs & Centers
- Medical Supplies & Equipment, Thurmont
- Membership Sports & Recreation Clubs, Thurmont
- Merchandise Sales Events, Thurmont
- Methodist Church, Thurmont
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- Mexican Restaurants, Thurmont
- Mill Supplies & Equipment, Thurmont - Milling Machines
- Mini & Self Storage, Thurmont
- Miscellaneous Agriculture, Thurmont
- Miscellaneous Government, Thurmont
- Miscellaneous Manufacturing, Thurmont
- Miscellaneous Personal Services, Thurmont
- Miscellaneous Professional, Thurmont
- Monuments, Tombstones, Markers & Memorials, Thurmont
- Moravian Churches, Thurmont
- Motion Picture & Television Production Services, Thurmont
- Motor Vehicle, Thurmont
- Motor Vehicle Rental & Leasing, Thurmont
- Moving Supplies & Equipment Rental, Thurmont
- Moving Truck Rental , Thurmont
- Mulch, Peat & Moss Products, Thurmont
- Music, Thurmont
- Musical Recording Services, Thurmont
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