- Machine Shop & Tool Repair Service, Denton
- Machinery Movers & Erectors, Denton
- Machinery, Supplies & Equipment - Business Production Related, Denton
- Machinery, Supplies & Equipment - Business Supplies Related, Denton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Denton
- Major Appliances, Denton - Household & Kitchen
- Management Consultants & Services, Denton
- Manufacturing, Denton
- Manufacturing Equipment & Supplies, Denton
- Manufacturing Products, Denton
- Marine Products And Services, Denton
- Marine Repair & Service Stations, Denton
- Marine Supplies & Equipment - Boat Engine & Drive Train Repair, Denton
- Marriage & Family Counselors, Denton
- Martial Arts & Self Defense Schools, Denton
- Masonry Contractors, Denton - Stone Mason, Brick Mason - Install & Repair
- Material Handling & Heavy Machinery & Equipment, Denton
- Membership Sports & Recreation Clubs, Denton
- Metal Buildings, Denton - Wood Buildings
- Metal Repair Service & Blacksmith, Denton - Iron Works
- Metal Stampings Manufacturers, Denton
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- Methodist Church, Denton
- Mexican Restaurants, Denton
- Millwork Contractors, Denton
- Miscellaneous Agriculture, Denton
- Miscellaneous Business Services, Denton
- Miscellaneous Government, Denton
- Miscellaneous Industry, Denton
- Miscellaneous Metal Work Manufacturers, Denton
- Miscellaneous Personal Services, Denton
- Miscellaneous Professional, Denton
- Mobile Home Insurance, Denton
- Moldings Materials, Denton
- Monuments, Tombstones, Markers & Memorials, Denton
- Mortgage Bankers & Correspondents, Denton
- Mortgages & Loans, Denton
- Motor Vehicle, Denton
- Motor Vehicle Rental & Leasing, Denton
- Moving Supplies & Equipment Rental, Denton
- Moving Truck Rental , Denton
- Muffler Shop & Exhaust Systems, Denton
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