- Machine Shop, Omro
- Machine Shop & Tool Repair Service, Omro
- Machinery, Supplies & Equipment - Construction & Contractor Related, Omro
- Major Appliances, Omro - Household & Kitchen
- Manifold Business Forms Manufacturers, Omro
- Manufacturers Agents & Representatives, Omro
- Manufacturers Representative, Omro - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Omro
- Marine Products And Services, Omro
- Marine Repair & Service Stations, Omro
- Marine Supplies & Equipment, Omro - Boat Supplies
- Marine Supplies & Equipment Repair, Omro - Boat Supplies & Equipment
- Masonry Materials & Supplies, Omro
- Massage Therapists & Professional, Omro
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- Massage Therapy, Omro
- Meat Market, Wholesale & Products, Omro
- Mechanical Contractors, Omro - Install, Service & Repair
- Membership Sports & Recreation Clubs, Omro
- Mexican Restaurants, Omro
- Miscellaneous Government, Omro
- Miscellaneous Manufacturing, Omro
- Miscellaneous Personal Services, Omro
- Miscellaneous Professional, Omro
- Mortgage Bankers & Correspondents, Omro
- Mortgage Contracts & Services, Omro
- Motor Vehicle, Omro
- Motor Vehicle Rental & Leasing, Omro
- Moving Truck Rental , Omro
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