- Machine Shop & Tool Repair Service, Denton
- Machinery, Supplies & Equipment - Business Production Related, Denton
- Machinery, Supplies & Equipment - Business Supplies Related, Denton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Denton
- Magnetic Inspection, Denton
- Management Consultants & Services, Denton
- Manicurists & Pedicurists, Denton
- Manufacturing, Denton
- Manufacturing & Industrial Consultants, Denton
- Manufacturing Equipment & Supplies, Denton
- Manufacturing Products, Denton
- Marine Electronic Equipment, Denton
- Marine Supplies & Equipment, Denton - Boat Supplies
- Marriage & Family Counselors, Denton
- Masonry Contractors, Denton - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Denton
- Massage Therapists & Professional, Denton
- Massage Therapy, Denton
- Mental Health Clinics, Denton - Treatment Centers
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- Mental Health Specialists, Denton - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Denton
- Metropolitan Church, Denton
- Mini & Self Storage, Denton
- Ministries Church, Denton
- Miscellaneous Agriculture, Denton
- Miscellaneous Government, Denton
- Miscellaneous Personal Services, Denton
- Miscellaneous Professional, 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
- Museums, Denton
- Musical Instruments Repair, Sales & Service, Denton
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