- Machine Shop, Duncanville
- Machine Shop & Tool Repair Service, Duncanville
- Machinery And Equipment Manufacturers, Duncanville
- Machinery, Supplies & Equipment - Business Production Related, Duncanville
- Machinery, Supplies & Equipment - Business Supplies Related, Duncanville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Duncanville
- Mailing, Delivery & Courier Service, Duncanville
- Maintenance, Cleaning & Sanitation, Duncanville
- Major Appliances, Duncanville - Household & Kitchen
- Management Consultants & Services, Duncanville
- Manicurists & Pedicurists, Duncanville
- Manufacturers Agents & Representatives, Duncanville
- Manufacturers Representative, Duncanville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Duncanville
- Manufacturing Products, Duncanville
- Marriage & Family Counselors, Duncanville
- Martial Arts & Self Defense Schools, Duncanville
- Masonry Materials & Supplies, Duncanville
- Massage Therapists & Professional, Duncanville
- Massage Therapy, Duncanville
- Medical & Health Service Organizations, Duncanville
- Medical Supplies & Equipment, Duncanville
- Mental Health Clinics, Duncanville - Treatment Centers
- Mental Health Specialists, Duncanville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Marketing Consultants, Duncanville
- Messianic Church, Duncanville
- Messianic Synagogues, Duncanville
- Metal Finishers, Duncanville
- Metal Lockers, Duncanville
- Metal Plating & Polishing, Duncanville
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- Metal Repair Service & Blacksmith, Duncanville - Iron Works
- Metal Working Machinery, Duncanville
- Methodist Church, Duncanville
- Mexican Restaurants, Duncanville
- Mildew Removal & Control, Duncanville - Mold Removal
- Mini & Self Storage, Duncanville
- Ministers, Duncanville
- Ministries Church, Duncanville
- Miscellaneous Household Item Repair, Duncanville
- Miscellaneous Government, Duncanville
- Miscellaneous Manufacturing, Duncanville
- Miscellaneous Personal Services, Duncanville
- Miscellaneous Photographers, Duncanville
- Miscellaneous Professional, Duncanville
- Mortgage Bankers & Correspondents, Duncanville
- Mortgage Brokers, Duncanville
- Mortgage Companies, Duncanville
- Mortgages & Loans, Duncanville
- Motivational Speakers & Consultants, Duncanville - Speakers, Lectures & Seminars
- Motor Vehicle, Duncanville
- Motor Vehicle Rental & Leasing, Duncanville
- Moving Companies, Duncanville
- Moving Supplies & Equipment Rental, Duncanville
- Moving Truck Rental , Duncanville
- Muffler Shop & Exhaust Systems, Duncanville
- Murals & Faux Finish Walls, Duncanville
- Museums, Duncanville
- Music, Duncanville
- Music Lessons, Duncanville
- Music Lessons - Instrumental, Duncanville
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