- Machinery, Supplies & Equipment - Business Production Related, Middle Island
- Machinery, Supplies & Equipment - Business Supplies Related, Middle Island
- Mail Delivery Service, Middle Island
- Maintenance, Cleaning & Sanitation, Middle Island
- Major Appliances, Middle Island - Household & Kitchen
- Manicurists & Pedicurists, Middle Island
- Manufacturing, Middle Island
- Marine Contractors & Designers, Middle Island
- Marine Surveyors & Adjustors, Middle Island
- Marriage & Family Counselors, Middle Island
- Martial Arts & Self Defense Schools, Middle Island
- Masonry Materials & Supplies, Middle Island
- Meat Market, Wholesale & Products, Middle Island
- Medical Supplies & Equipment, Middle Island
- Mexican Restaurants, Middle Island
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- Mildew Removal & Control, Middle Island - Mold Removal
- Miscellaneous Government, Middle Island
- Miscellaneous Personal Services, Middle Island
- Miscellaneous Professional, Middle Island
- Motion Pictures Video Tape Duplication & Transfer Services, Middle Island
- Motor Vehicle, Middle Island
- Motor Vehicle Rental & Leasing, Middle Island
- Motorcycle & Motor Scooters Dealers, Repair & Service, Middle Island
- Motorcycle Repair & Service, Middle Island
- Moving Truck Rental , Middle Island
- Muffler Shop & Exhaust Systems, Middle Island
- Music, Middle Island
- Musical Instruments & Equipment Stores, Middle Island
- Musical Instruments - Guitars, Middle Island
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