- 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 Appliance Parts, Washington
- Major Appliances, Washington - Household & Kitchen
- Malls & Shopping Centers, Washington
- Management Consultants & Services, Washington
- Manicurists & Pedicurists, Washington
- Manufacturing, Washington
- Manufacturing Products, Washington
- Masonry Materials & Supplies, Washington
- Mechanical Contractors, Washington - Install, Service & Repair
- Mechanical Engineer, Washington - Mechanical Engineering Service
- Medical & Dental Assistant Schools, Washington
- Medical Research Facilities, Washington - Research & Development Centers
- Medical Supplies & Equipment, Washington
- Membership Sports & Recreation Clubs, Washington
- Metal Stampings Manufacturers, Washington
- Mexican Food & Goods Products, Washington
- Mexican Restaurants, Washington
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Washington
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- Miscellaneous Government, Washington
- Miscellaneous Manufacturing, Washington
- Miscellaneous Metal Work Manufacturers, Washington
- Miscellaneous Personal Services, Washington
- Miscellaneous Photographers, Washington
- Miscellaneous Professional, Washington
- Mobile Home Parks & Communities , Washington
- Mortgage Bankers & Correspondents, Washington
- Mortgage Contracts & Services, Washington
- Mortgages & Loans, Washington
- Motion Pictures Video Tape Duplication & Transfer Services, Washington
- Motor Vehicle, Washington
- Motor Vehicle Rental & Leasing, Washington
- Motorcycle Parts, Accessories & Dealers, Washington
- Moving & Storage Supplies & Equipment, Washington
- Moving Companies, Washington
- Moving Services - Labor & Material, Washington
- Moving Truck Rental , Washington
- Muffler Shop & Exhaust Systems, Washington
- Museums, Washington
- Music, Washington
- Musical Instruments & Equipment Stores, Washington
- Musical Instruments Repair, Sales & Service, Washington
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