- 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
- Magazine & Newspaper Stands, Washington - Dealers & Distributors
- Mailing, Delivery & Courier Service, Washington
- Malls & Shopping Centers, Washington
- Management Consultants & Services, Washington
- Manicurists & Pedicurists, Washington
- Manufacturing, Washington
- Martial Arts & Self Defense Schools, Washington
- Masonry Contractors, Washington - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Washington
- Massage Therapy, Washington
- Meat Market, Wholesale & Products, Washington
- Mechanical Contractors, Washington - Install, Service & Repair
- Mechanical Engineer, Washington - Mechanical Engineering Service
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Washington
- Medical Research Facilities, Washington - Research & Development Centers
- Medical Supplies & Equipment, Washington
- Mediterranean Restaurants, Washington
- Membership Sports & Recreation Clubs, Washington
- Men's Clothing Stores, Washington - Clothes & Accessories
- Mental Health Specialists, Washington - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Washington
- Milk & Milk Products, Washington
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- Millwork Contractors, Washington
- Millwrights, Washington
- Mini & Self Storage, Washington
- Mirrors, Washington - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Washington
- Miscellaneous Government, Washington
- Miscellaneous Industry, 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
- Motorcycle & Motor Scooters Dealers, Repair & Service, Washington
- Motorcycle Parts, Accessories & Dealers, Washington
- Motorcycle Repair & Service, Washington
- Moving Companies, Washington
- Moving Supplies & Equipment Rental, Washington
- Moving Truck Rental , Washington
- Music, Washington
- Musical Instrument Rental, Washington - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Washington
- Musical Instruments Repair, Sales & Service, Washington
- Musical Recording Services, Washington
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