- Machinery, Supplies & Equipment - Business Production Related, Stony Brook
- Machinery, Supplies & Equipment - Business Supplies Related, Stony Brook
- Mailbox Rental Services, Stony Brook
- Mailing, Delivery & Courier Service, Stony Brook
- Major Appliances, Stony Brook - Household & Kitchen
- Malls & Shopping Centers, Stony Brook
- Management Consultants & Services, Stony Brook
- Manicurists & Pedicurists, Stony Brook
- Manufacturing, Stony Brook
- Manufacturing Products, Stony Brook
- Marinas & Marina Services, Stony Brook
- Marriage & Family Counselors, Stony Brook
- Martial Arts & Self Defense Schools, Stony Brook
- Medical Diagnostic Clinics, Stony Brook - Clinical Labs & Centers
- Medical Supplies & Equipment, Stony Brook
- Membership Sports & Recreation Clubs, Stony Brook
- Men's Clothing Stores, Stony Brook - Clothes & Accessories
- Mental Health Specialists, Stony Brook - Psychologist, Psychiatrist, Psychotherapist, etc
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- Metal Plating & Polishing, Stony Brook
- Methodist Church, Stony Brook
- Mexican Restaurants, Stony Brook
- Miscellaneous Household Item Repair, Stony Brook
- Miscellaneous Government, Stony Brook
- Miscellaneous Personal Services, Stony Brook
- Miscellaneous Photographers, Stony Brook
- Miscellaneous Professional, Stony Brook
- Mortgage Bankers & Correspondents, Stony Brook
- Motor Vehicle, Stony Brook
- Movie Theaters, Stony Brook
- Moving & Storage Supplies & Equipment, Stony Brook
- Museums, Stony Brook
- Music, Stony Brook
- Music Lessons, Stony Brook
- Music Lessons - Instrumental, Stony Brook
- Musical Recording Services, Stony Brook
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