- Machine Shop, Omak
- Machine Shop & Tool Repair Service, Omak
- Machinery, Supplies & Equipment - Business Production Related, Omak
- Machinery, Supplies & Equipment - Business Supplies Related, Omak
- Machinery, Supplies & Equipment - Construction & Contractor Related, Omak
- Major Appliances, Omak - Household & Kitchen
- Management Consultants & Services, Omak
- Manicurists & Pedicurists, Omak
- Manufacturing, Omak
- Marine Supplies & Equipment, Omak - Boat Supplies
- Marriage & Family Counselors, Omak
- Massage Therapists & Professional, Omak
- Massage Therapy, Omak
- Medical Groups & Clinics, Omak - Medical & Health Centers
- Medical Supplies & Equipment, Omak
- Men's & Boys Clothing & Accessories Stores, Omak
- Mens & Boys Hats, Gloves & Neckwear, Omak
- Mental Health Specialists, Omak - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Omak - Iron Works
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- Methodist Church, Omak
- Mexican & Latin American Goods & Products Stores, Omak
- Mexican Restaurants, Omak
- Miscellaneous Business Product Repair, Omak
- Miscellaneous Government, Omak
- Miscellaneous Personal Services, Omak
- Miscellaneous Professional, Omak
- Money Transfer Service, Omak
- Mortgage Bankers & Correspondents, Omak
- Mortgage Companies, Omak
- Mortgage Contracts & Services, Omak
- Mortgages & Loans, Omak
- Motor Vehicle, Omak
- Motor Vehicle Rental & Leasing, Omak
- Motorcycle Parts, Accessories & Dealers, Omak
- Movie Theaters, Omak
- Moving Supplies & Equipment Rental, Omak
- Moving Truck Rental , Omak
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