- Machinery, Supplies & Equipment - Business Production Related, Milton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Milton
- Major Appliances, Milton - Household & Kitchen
- Management Consultants & Services, Milton
- Manicurists & Pedicurists, Milton
- Manufacturing, Milton
- Masonry Contractors, Milton - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Milton
- Massage Therapy, Milton
- Measuring Instruments, Milton - Measuring Machines & Equipment
- Meat Market, Wholesale & Products, Milton
- Medical & Dental Management, Milton
- Medical & Health Service Organizations, Milton
- Medical Diagnostic Clinics, Milton - Clinical Labs & Centers
- Medical Management & Business Administration Service, Milton
- Medicine & Bathroom Cabinets Manufacturers, Milton
- Membership Sports & Recreation Clubs, Milton
- Mental Health Specialists, Milton - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Milton
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- Metal Repair Service & Blacksmith, Milton - Iron Works
- Metaphysical Churches, Milton
- Methodist Church, Milton
- Mini & Self Storage, Milton
- Miscellaneous Household Item Repair, Milton
- Miscellaneous Business Services, Milton
- Miscellaneous Government, Milton
- Miscellaneous Personal Services, Milton
- Miscellaneous Professional, Milton
- Miscellaneous Toys & Supplies, Milton
- Mortgage Bankers & Correspondents, Milton
- Motion Picture & Television Production Services, Milton
- Motion Picture Pre & Post Production Services, Milton
- Motor Vehicle, Milton
- Moving Companies, Milton
- Museums, Milton
- Music, Milton
- Musical Instrument Rental, Milton - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Milton
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