- Machinery, Supplies & Equipment - Business Production Related, Smithtown
- Machinery, Supplies & Equipment - Business Supplies Related, Smithtown
- Machinery, Supplies & Equipment - Construction & Contractor Related, Smithtown
- Magicians & Hypnotist Entertainers, Smithtown
- Mail Delivery Service, Smithtown
- Mailbox Rental Services, Smithtown
- Mailing, Delivery & Courier Service, Smithtown
- Maintenance, Cleaning & Sanitation, Smithtown
- Make Up & Cosmetics Application, Smithtown
- Management Consultants & Services, Smithtown
- Manicurists & Pedicurists, Smithtown
- Manifold Business Forms Manufacturers, Smithtown
- Manufacturing, Smithtown
- Manufacturing & Industrial Consultants, Smithtown
- Maps & Globes, Smithtown
- Marble, Smithtown
- Marine Products And Services, Smithtown
- Marine Services, Smithtown
- Marine Supplies & Equipment, Smithtown - Boat Supplies
- Marriage & Family Counselors, Smithtown
- Marriage & Family Counselors Information & Referrals, Smithtown
- Martial Arts & Self Defense Schools, Smithtown
- Masonry Contractors, Smithtown - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Smithtown
- Massage Therapists & Professional, Smithtown
- Massage Therapy, Smithtown
- Massage Therapy Relaxation, Smithtown
- Meat Market, Wholesale & Products, Smithtown
- Mechanical Contractors, Smithtown - Install, Service & Repair
- Medical & Dental Management, Smithtown
- Medical & Health Service Organizations, Smithtown
- Medical Diagnostic Clinics, Smithtown - Clinical Labs & Centers
- Medical Management & Business Administration Service, Smithtown
- Medical Supplies & Equipment, Smithtown
- Membership Sports & Recreation Clubs, Smithtown
- Men's Clothing Stores, Smithtown - Clothes & Accessories
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- Mental Health Specialists, Smithtown - Psychologist, Psychiatrist, Psychotherapist, etc
- Messenger Service, Smithtown - Message Receiving & Forwarding Service
- Metal Repair Service & Blacksmith, Smithtown - Iron Works
- Metal Tanks, Smithtown
- Methodist Church, Smithtown
- Mexican Restaurants, Smithtown
- Mildew Removal & Control, Smithtown - Mold Removal
- Mind-Body Massage, Smithtown
- Mirrors, Smithtown - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Smithtown
- Miscellaneous Household Item Repair, Smithtown
- Miscellaneous Prosthesis & Appliances, Smithtown
- Miscellaneous Business Services, Smithtown
- Miscellaneous Government, Smithtown
- Miscellaneous Personal Services, Smithtown
- Miscellaneous Photographers, Smithtown
- Miscellaneous Professional, Smithtown
- Mission Churches, Smithtown
- Monuments, Tombstones, Markers & Memorials, Smithtown
- Mortgage Bankers & Correspondents, Smithtown
- Motor Vehicle, Smithtown
- Motor Vehicle Rental & Leasing, Smithtown
- Motorcycle Parts, Accessories & Dealers, Smithtown
- Moving & Storage Supplies & Equipment, Smithtown
- Moving Companies, Smithtown
- Moving Supplies & Equipment Rental, Smithtown
- Moving Truck Rental , Smithtown
- Muffler Shop & Exhaust Systems, Smithtown
- Music, Smithtown
- Music Entertainment, Smithtown
- Music Lessons, Smithtown
- Music Lessons - Instrumental, Smithtown
- Musical Instruments & Equipment Stores, Smithtown
- Musical Instruments Repair, Sales & Service, Smithtown
- Musical Recording Services, Smithtown
- Musicians, Bands & Disc Jockeys, Smithtown
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