- Machine Shop, New Hamburg
- Machine Shop & Tool Repair Service, New Hamburg
- Machinery, Supplies & Equipment - Business Production Related, New Hamburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, New Hamburg
- Management Consultants & Services, New Hamburg
- Manufacturing, New Hamburg
- Manufacturing Products, New Hamburg
- Marine Supplies & Equipment, New Hamburg - Boat Supplies
- Marriage & Family Counselors, New Hamburg
- Martial Arts & Self Defense Schools, New Hamburg
- Masonry Materials & Supplies, New Hamburg
- Massage Therapists & Professional, New Hamburg
- Massage Therapy, New Hamburg
- Mechanical Contractors, New Hamburg - Install, Service & Repair
- Medical Supplies & Equipment, New Hamburg
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- Membership Sports & Recreation Clubs, New Hamburg
- Men's Clothing Stores, New Hamburg - Clothes & Accessories
- Mennonite Church, New Hamburg
- Mini & Self Storage, New Hamburg
- Miscellaneous Government, New Hamburg
- Miscellaneous Manufacturing, New Hamburg
- Miscellaneous Personal Services, New Hamburg
- Miscellaneous Photographers, New Hamburg
- Miscellaneous Professional, New Hamburg
- Mortgage Bankers & Correspondents, New Hamburg
- Motor Vehicle, New Hamburg
- Motor Vehicle Rental & Leasing, New Hamburg
- Motorcycle Parts, Accessories & Dealers, New Hamburg
- Moving & Storage Supplies & Equipment, New Hamburg
- Moving Companies, New Hamburg
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