- Machine Shop, Dover
- Machine Shop & Tool Repair Service, Dover
- Machinery, Supplies & Equipment - Business Production Related, Dover
- Machinery, Supplies & Equipment - Business Supplies Related, Dover
- Machinery, Supplies & Equipment - Construction & Contractor Related, Dover
- Maintenance, Cleaning & Sanitation, Dover
- Major Appliances, Dover - Household & Kitchen
- Malls & Shopping Centers, Dover
- Management Consultants & Services, Dover
- Manicurists & Pedicurists, Dover
- Manufacturing, Dover
- Manufacturing Products, Dover
- Marriage & Family Counselors, Dover
- Masonry Contractors, Dover - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Dover
- Massage Therapists & Professional, Dover
- Massage Therapy, Dover
- Material Handling & Heavy Machinery & Equipment, Dover
- Material Handling Equipment, Dover - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Dover
- Medical Supplies & Equipment, Dover
- Mental Health Specialists, Dover - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Dover
- Metal Distributors, Dover
- Metal Working Machinery, Dover
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- Methodist Church, Dover
- Mexican Restaurants, Dover
- Mildew Removal & Control, Dover - Mold Removal
- Millwork Contractors, Dover
- Mirrors, Dover - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Dover
- Miscellaneous Government, Dover
- Miscellaneous Industry, Dover
- Miscellaneous Manufacturing, Dover
- Miscellaneous Personal Services, Dover
- Miscellaneous Professional, Dover
- Modular & Mobile Homes For Sale, Dover - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Dover
- Moravian Churches, Dover
- Mortgage Bankers & Correspondents, Dover
- Motion Picture Pre & Post Production Services, Dover
- Motor Vehicle, Dover
- Motor Vehicle Rental & Leasing, Dover
- Motorcycle Parts, Accessories & Dealers, Dover
- Moving Truck Rental , Dover
- Museums, Dover
- Music, Dover
- Music Entertainment, Dover
- Musicians, Bands & Disc Jockeys, Dover
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