- Machine Shop, Dover
- Machine Shop & Tool Repair Service, Dover
- Machine Shops Experimental, Dover
- Machine Tool Repair & Rebuild, Dover
- Machinery Movers & Erectors, Dover
- Machinery, Supplies & Equipment - Business Production Related, Dover
- Machinery, Supplies & Equipment - Business Supplies Related, Dover
- Machinery, Supplies & Equipment - Construction & Contractor Related, Dover
- Mailing, Delivery & Courier Service, Dover
- Maintenance, Cleaning & Sanitation, Dover
- Major Appliances, Dover - Household & Kitchen
- Management Consultants & Services, Dover
- Manicurists & Pedicurists, Dover
- Manufacturers Agents & Representatives, Dover
- Manufacturers Representative, Dover - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Dover
- Manufacturing & Industrial Consultants, Dover
- Manufacturing Products, Dover
- Manufacturing Services, Dover
- Marinas & Marina Services, Dover
- Market Research & Analysis , Dover - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Dover
- Martial Arts & Self Defense Schools, Dover
- Masonry Contractors, Dover - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Dover
- Massage Therapists & Professional, Dover
- Massage Therapy, Dover
- Mastectomy Apparel, Forms, Prostheses & Supplies, Dover
- Material Handling & Heavy Machinery & Equipment, Dover
- Meat Market, Wholesale & Products, Dover
- Medical Alert Systems, Dover - Medical Alarms - PERS
- Medical Groups & Clinics, Dover - Medical & Health Centers
- Medical Supplies & Equipment, Dover
- Membership Sports & Recreation Clubs, Dover
- Memory Improvement Instruction, Dover
- Men's Clothing Stores, Dover - Clothes & Accessories
- Mental Health Clinics, Dover - Treatment Centers
- Mental Health Specialists, Dover - Psychologist, Psychiatrist, Psychotherapist, etc
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- Merchandise Sales Events, Dover
- Metal Plating & Polishing, Dover
- Methodist Church, Dover
- Mexican Restaurants, Dover
- Middle Eastern Restaurants, Dover
- Midwives, Dover
- Mildew Removal & Control, Dover - Mold Removal
- Mining, Dover
- Mirrors, Dover - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Dover
- Miscellaneous Agriculture, Dover
- Miscellaneous Business Services, Dover
- Miscellaneous Government, Dover
- Miscellaneous Manufacturing, Dover
- Miscellaneous Personal Services, Dover
- Miscellaneous Photographers, Dover
- Miscellaneous Professional, Dover
- Mobile Home Parks & Communities , Dover
- Modular & Mobile Homes For Sale, Dover - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Dover
- Mortgage Companies, Dover
- Motor Vehicle, Dover
- Motor Vehicle Rental & Leasing, Dover
- Motorcycle & Motor Scooters Dealers, Repair & Service, Dover
- Motorcycle Parts, Accessories & Dealers, Dover
- Motorcycle Repair & Service, Dover
- Movie Theaters, Dover
- Moving Companies, Dover
- Moving Truck Rental , Dover
- Muffler Shop & Exhaust Systems, Dover
- Mulch, Peat & Moss Products, Dover
- Multimedia Publishers, Dover - Multimedia Services & Systems
- Museums, Dover
- Music, Dover
- Music Lessons, Dover
- Music Lessons - Instrumental, Dover
- Musical Instruments & Equipment Stores, Dover
- Musical Recording Services, Dover
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