- Machine Shop, Calverton
- Machinery, Supplies & Equipment - Business Supplies Related, Calverton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Calverton
- Major Appliances, Calverton - Household & Kitchen
- Management Consultants & Services, Calverton
- Manifold Business Forms Manufacturers, Calverton
- Manufacturing, Calverton
- Manufacturing Products, Calverton
- Marble, Calverton
- Marine Contractors & Designers, Calverton
- Martial Arts & Self Defense Schools, Calverton
- Masonry Contractors, Calverton - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Calverton
- Membership Sports & Recreation Clubs, Calverton
- Merchandise Sales Events, Calverton
- Messenger Service, Calverton - Message Receiving & Forwarding Service
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- Metal Repair Service & Blacksmith, Calverton - Iron Works
- Mexican Restaurants, Calverton
- Milk & Milk Products, Calverton
- Mirrors, Calverton - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Agriculture, Calverton
- Miscellaneous Government, Calverton
- Miscellaneous Personal Services, Calverton
- Mobile Home Parks & Communities , Calverton
- Modular & Mobile Homes For Sale, Calverton - Manufactured Homes Sale & Service
- Moldings Materials, Calverton
- Motor Vehicle, Calverton
- Motor Vehicle Rental & Leasing, Calverton
- Movie Theaters, Calverton
- Moving Companies, Calverton
- Moving Truck Rental , Calverton
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