- Machine Shop & Tool Repair Service, Portland
- Machinery Repair & Rebuild, Portland
- Machinery, Supplies & Equipment - Business Supplies Related, Portland
- Machinery, Supplies & Equipment - Construction & Contractor Related, Portland
- Major Appliances, Portland - Household & Kitchen
- Manicurists & Pedicurists, Portland
- Manufacturing, Portland
- Manufacturing Products, Portland
- Masonry Materials & Supplies, Portland
- Massage Therapy, Portland
- Maytag Appliances, Portland
- Meat Market, Wholesale & Products, Portland
- Mechanical Contractors, Portland - Install, Service & Repair
- Medical Supplies & Equipment, Portland
- Mental Health Clinics, Portland - Treatment Centers
- Mental Health Specialists, Portland - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Portland
- Metal Plating & Polishing, Portland
- Metal Working Machinery, Portland
- Methodist Church, Portland
- Mexican & Latin American Goods & Products Stores, Portland
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- Mexican Restaurants, Portland
- Mini & Self Storage, Portland
- Miscellaneous Business Services, Portland
- Miscellaneous Government, Portland
- Miscellaneous Industry, Portland
- Miscellaneous Manufacturing, Portland
- Miscellaneous Personal Services, Portland
- Miscellaneous Professional, Portland
- Mobile Home Parks & Communities , Portland
- Mortgage Bankers & Correspondents, Portland
- Motor Vehicle, Portland
- Motor Vehicle Rental & Leasing, Portland
- Motorcycle Parts, Accessories & Dealers, Portland
- Movie Theaters, Portland
- Moving Supplies & Equipment Rental, Portland
- Moving Truck Rental , Portland
- Museums, Portland
- Music, Portland
- Music Lessons, Portland
- Music Lessons - Vocal, Portland
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