- Machine Shop, Wilmington
- Machinery Movers & Erectors, Wilmington
- Machinery, Supplies & Equipment - Business Production Related, Wilmington
- Machinery, Supplies & Equipment - Business Supplies Related, Wilmington
- Machinery, Supplies & Equipment - Construction & Contractor Related, Wilmington
- Macrame & Macrame Supplies, Wilmington
- Magazine & Newspaper Stands, Wilmington - Dealers & Distributors
- Mailing, Delivery & Courier Service, Wilmington
- Major Appliances, Wilmington - Household & Kitchen
- Management Consultants & Services, Wilmington
- Manicurists & Pedicurists, Wilmington
- Manufacturers Agents & Representatives, Wilmington
- Manufacturers Representative, Wilmington - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Wilmington
- Manufacturing Products, Wilmington
- Marble, Wilmington
- Marble Stone Products, Wilmington
- Marinas & Marina Services, Wilmington
- Marine Contractors & Designers, Wilmington
- Marine Hardware, Wilmington
- Marine Pilot & Operator Service, Wilmington
- Marine Products And Services, Wilmington
- Marine Repair & Service Stations, Wilmington
- Marine Services, Wilmington
- Marine Supplies & Equipment, Wilmington - Boat Supplies
- Marine Supplies & Equipment Repair, Wilmington - Boat Supplies & Equipment
- Marine Surveyors & Adjustors, Wilmington
- Martial Arts & Self Defense Schools, Wilmington
- Masonry Materials & Supplies, Wilmington
- Massage Therapists & Professional, Wilmington
- Massage Therapy, Wilmington
- Material Handling & Heavy Machinery & Equipment, Wilmington
- Meat Market, Wholesale & Products, Wilmington
- Medical Equipment Manufacturers, Wilmington
- Medical Products & Equipment, Wilmington
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- Membership Sports & Recreation Clubs, Wilmington
- Men's & Boys Clothing & Accessories Stores, Wilmington
- Men's Clothing Stores, Wilmington - Clothes & Accessories
- Mens & Boys Jeans & Western Wear Stores, Wilmington
- Messianic Synagogues, Wilmington
- Metal Plating & Polishing, Wilmington
- Metal Polishing & Buffing, Wilmington
- Metal Repair Service & Blacksmith, Wilmington - Iron Works
- Metals Base, Wilmington
- Mexican Restaurants, Wilmington
- Mini & Self Storage, Wilmington
- Mining, Wilmington
- Miscellaneous Household Item Repair, Wilmington
- Miscellaneous Business Services, Wilmington
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Wilmington
- Miscellaneous Government, Wilmington
- Miscellaneous Manufacturing, Wilmington
- Miscellaneous Personal Services, Wilmington
- Miscellaneous Photographers, Wilmington
- Miscellaneous Professional, Wilmington
- Mobile Home Parks & Communities , Wilmington
- Money Transfer Service, Wilmington
- Mortgages & Loans, Wilmington
- Motor Vehicle, Wilmington
- Motor Vehicle Rental & Leasing, Wilmington
- Moving Companies, Wilmington
- Moving Services - Labor & Material, Wilmington
- Moving Truck Rental , Wilmington
- Muffler & Exhaust Systems Wholesale, Wilmington
- Muffler Shop & Exhaust Systems, Wilmington
- Mufflers & Exhaust Systems Manufacturers, Wilmington
- Museums, Wilmington
- Music, Wilmington
- Musical Instrument Rental, Wilmington - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Wilmington
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