- Machine Shop & Tool Repair Service, Middleton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Middleton
- Manufacturing, Middleton
- Masonry Materials & Supplies, Middleton
- Massage Therapists & Professional, Middleton
- Massage Therapy, Middleton
- Meat Packers, Middleton
- Medical Supplies & Equipment, Middleton
- Membership Sports & Recreation Clubs, Middleton
- Mental Health Clinics, Middleton - Treatment Centers
- Mental Health Specialists, Middleton - Psychologist, Psychiatrist, Psychotherapist, etc
- Mini & Self Storage, Middleton
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- Miscellaneous Business Product Repair, Middleton
- Miscellaneous Agriculture, Middleton
- Miscellaneous Business Services, Middleton
- Miscellaneous Government, Middleton
- Miscellaneous Personal Services, Middleton
- Miscellaneous Professional, Middleton
- Motor Vehicle, Middleton
- Motor Vehicle Rental & Leasing, Middleton
- Moving Companies, Middleton
- Moving Truck Rental , Middleton
- Museums, Middleton
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