- Machine Shop & Tool Repair Service, Washington
- Machinery Movers & Erectors, Washington
- Machinery, Supplies & Equipment - Business Production Related, Washington
- Machinery, Supplies & Equipment - Business Supplies Related, Washington
- Machinery, Supplies & Equipment - Construction & Contractor Related, Washington
- Mailing, Delivery & Courier Service, Washington
- Major Appliances, Washington - Household & Kitchen
- Malls & Shopping Centers, Washington
- Management Consultants & Services, Washington
- Manicurists & Pedicurists, Washington
- Manufactured & Mobile Home Movers & Transporting, Washington
- Manufacturing, Washington
- Manufacturing Products, Washington
- Marinas & Aquariums, Washington
- Marinas & Marina Services, Washington
- Marine Electronic Equipment, Washington
- Marine Products And Services, Washington
- Marine Services, Washington
- Marine Supplies & Equipment, Washington - Boat Supplies
- Marriage & Family Counselors, Washington
- Masonry Materials & Supplies, Washington
- Massage Therapy, Washington
- Mastectomy Apparel, Forms, Prostheses & Supplies, Washington
- Meat Market, Wholesale & Products, Washington
- Medical Alert Systems, Washington - Medical Alarms - PERS
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Washington
- Medical Research Facilities, Washington - Research & Development Centers
- Medical Supplies & Equipment, Washington
- Meeting & Event Planning Services, Washington - Conference Consultants
- Membership Sports & Recreation Clubs, Washington
- Men's Clothing Stores, Washington - Clothes & Accessories
- Mental Health Clinics, Washington - Treatment Centers
- Mental Health Specialists, Washington - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Washington
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- Merle Norman Cosmetics, Washington
- Metal Buildings, Washington - Kits, Homes, Steel Buildings, etc
- Methodist Church, Washington
- Mexican Food & Goods Products, Washington
- Mexican Restaurants, Washington
- Mini & Self Storage, Washington
- Ministries Church, Washington
- Mirrors, Washington - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Government, Washington
- Miscellaneous Industry, Washington
- Miscellaneous Personal Services, Washington
- Miscellaneous Professional, Washington
- Mission Churches, Washington
- Mobile Home Parks & Communities , Washington
- Modular & Mobile Homes For Sale, Washington - Manufactured Homes Sale & Service
- Moisture & Vapor Control, Washington
- Money Transfer Service, Washington
- Monuments, Tombstones, Markers & Memorials, Washington
- Mortgage Bankers & Correspondents, Washington
- Mortgage Companies, Washington
- Mortgage Contracts & Services, Washington
- Mortgages & Loans, Washington
- Motor Vehicle, Washington
- Motor Vehicle Rental & Leasing, Washington
- Motorcycle Parts, Accessories & Dealers, Washington
- Moving Companies, Washington
- Moving Supplies & Equipment Rental, Washington
- Moving Truck Rental , Washington
- Muffler Shop & Exhaust Systems, Washington
- Museums, Washington
- Music, Washington
- Musical Instruments & Equipment Stores, Washington
- Musical Recording Services, Washington
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