- Machine Shop & Tool Repair Service, Dix Hills
- Machinery, Supplies & Equipment - Business Supplies Related, Dix Hills
- Machinery, Supplies & Equipment - Construction & Contractor Related, Dix Hills
- Maintenance, Cleaning & Sanitation, Dix Hills
- Major Appliances, Dix Hills - Household & Kitchen
- Management Consultants & Services, Dix Hills
- Manufacturing, Dix Hills
- Marble Contractors, Dix Hills - Installation, Cleaning & Removal Services
- Marine Contractors & Designers, Dix Hills
- Market Research & Analysis , Dix Hills - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Dix Hills
- Masonry Contractors, Dix Hills - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Dix Hills
- Massage Therapy, Dix Hills
- Meat Market, Wholesale & Products, Dix Hills
- Mechanical Engineer, Dix Hills - Mechanical Engineering Service
- Medical Diagnostic Clinics, Dix Hills - Clinical Labs & Centers
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- Medical Supplies & Equipment, Dix Hills
- Mental Health Specialists, Dix Hills - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Dix Hills
- Mildew Removal & Control, Dix Hills - Mold Removal
- Miscellaneous Business Services, Dix Hills
- Miscellaneous Government, Dix Hills
- Miscellaneous Professional, Dix Hills
- Money Transfer Service, Dix Hills
- Motion Picture Pre & Post Production Services, Dix Hills
- Motor Vehicle, Dix Hills
- Motor Vehicle Rental & Leasing, Dix Hills
- Motorcycle Parts, Accessories & Dealers, Dix Hills
- Music, Dix Hills
- Musical Instrument Manufacturers, Dix Hills
- Musical Instruments & Equipment Stores, Dix Hills
- Musical Instruments - Violins, Dix Hills
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