- Machine Shop, Washington
- Machine Shop & Tool Repair Service, Washington
- Machinery, Supplies & Equipment - Business Production Related, Washington
- Machinery, Supplies & Equipment - Business Supplies Related, Washington
- Machinery, Supplies & Equipment - Construction & Contractor Related, Washington
- Mail Delivery Service, Washington
- Major Appliances, Washington - Household & Kitchen
- Manufacturing, Washington
- Manufacturing Products, Washington
- Marriage & Family Counselors, Washington
- Masonry Materials & Supplies, Washington
- Massage Therapists & Professional, Washington
- Massage Therapy, Washington
- Meat Market, Wholesale & Products, Washington
- Medical Diagnostic Clinics, Washington - Clinical Labs & Centers
- Medical Groups & Clinics, Washington - Medical & Health Centers
- Medical Supplies & Equipment, Washington
- Membership Sports & Recreation Clubs, Washington
- Mennonite Church, Washington
- Mental Health Specialists, Washington - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Washington - Wood Buildings
- Metal Buildings, Washington - Kits, Homes, Steel Buildings, etc
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- Methodist Church, Washington
- Mexican Restaurants, Washington
- Mini & Self Storage, Washington
- Mining, Washington
- Miscellaneous Business Product Repair, Washington
- Miscellaneous Government, Washington
- Miscellaneous Personal Services, Washington
- Miscellaneous Photographers, Washington
- Miscellaneous Professional, Washington
- Monuments, Tombstones, Markers & Memorials, Washington
- Mortgage Bankers & Correspondents, Washington
- Mortgages & Loans, Washington
- Motor Vehicle, Washington
- Motor Vehicle Rental & Leasing, Washington
- Movie Theaters, Washington
- Moving Supplies & Equipment Rental, Washington
- Moving Truck Rental , Washington
- Muffler Shop & Exhaust Systems, Washington
- Music, Washington
- Musical Instrument Rental, Washington - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Washington
- Musical Instruments Repair, Sales & Service, Washington
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