- Machine Shop & Tool Repair Service, Middleton
- Machinery, Supplies & Equipment - Business Production Related, Middleton
- Machinery, Supplies & Equipment - Business Supplies Related, Middleton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Middleton
- Major Appliances, Middleton - Household & Kitchen
- Management Consultants & Services, Middleton
- Manicurists & Pedicurists, Middleton
- Manufacturing, Middleton
- Manufacturing & Industrial Consultants, Middleton
- Manufacturing Products, Middleton
- Marine Products And Services, Middleton
- Marine Repair & Service Stations, Middleton
- Marine Supplies & Equipment Repair, Middleton - Boat Supplies & Equipment
- Marriage & Family Counselors, Middleton
- Martial Arts & Self Defense Schools, Middleton
- Masonry Contractors, Middleton - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Middleton
- Massage Therapists & Professional, Middleton
- Massage Therapy, Middleton
- Massage Therapy Relaxation, Middleton
- Material Handling & Heavy Machinery & Equipment, Middleton
- Measuring Instruments, Middleton - Measuring Machines & Equipment
- Medical & Dental Management, Middleton
- Medical Billing Services, Middleton
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- Medical Management & Business Administration Service, Middleton
- Medical Supplies & Equipment, Middleton
- Membership Sports & Recreation Clubs, Middleton
- Men's Clothing Stores, Middleton - Clothes & Accessories
- Mental Health Specialists, Middleton - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Middleton
- Mind-Body Massage, Middleton
- Mini & Self Storage, Middleton
- Mini Golf Courses, Middleton
- Mining, Middleton
- Mining Contractors, Middleton - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Middleton - Mining Companies
- Miscellaneous Business Product Repair, Middleton
- Miscellaneous Household Item Repair, Middleton
- Miscellaneous Government, Middleton
- Miscellaneous Personal Services, Middleton
- Miscellaneous Professional, Middleton
- Mortgage Bankers & Correspondents, Middleton
- Motion Picture Pre & Post Production Services, Middleton
- Motor Vehicle, Middleton
- Motor Vehicle Rental & Leasing, Middleton
- Moving Supplies & Equipment Rental, Middleton
- Moving Truck Rental , Middleton
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