- Machinery, Supplies & Equipment - Business Production Related, Onalaska
- Machinery, Supplies & Equipment - Construction & Contractor Related, Onalaska
- Manicurists & Pedicurists, Onalaska
- Manufacturing, Onalaska
- Marinas & Marina Services, Onalaska
- Marine Products And Services, Onalaska
- Marine Services, Onalaska
- Marriage & Family Counselors, Onalaska
- Martial Arts & Self Defense Schools, Onalaska
- Masonry Materials & Supplies, Onalaska
- Metal Repair Service & Blacksmith, Onalaska - Iron Works
- Methodist Church, Onalaska
- Mexican Restaurants, Onalaska
- Mini & Self Storage, Onalaska
- Ministers, Onalaska
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- Ministries Church, Onalaska
- Miscellaneous Business Services, Onalaska
- Miscellaneous Government, Onalaska
- Miscellaneous Personal Services, Onalaska
- Miscellaneous Professional, Onalaska
- Mortgage Bankers & Correspondents, Onalaska
- Motor Sports, Onalaska
- Motor Vehicle, Onalaska
- Motor Vehicle Rental & Leasing, Onalaska
- Motorcycle Parts, Accessories & Dealers, Onalaska
- Moving Companies, Onalaska
- Moving Supplies & Equipment Rental, Onalaska
- Moving Truck Rental , Onalaska
- Muffler Shop & Exhaust Systems, Onalaska
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