- Machinery, Supplies & Equipment - Construction & Contractor Related, Portland
- Manufacturing, Portland
- Manufacturing Products, Portland
- Marriage & Family Counselors, Portland
- Martial Arts & Self Defense Schools, Portland
- Masonry Contractors, Portland - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Portland
- Massage Therapy, Portland
- Medical Supplies & Equipment, Portland
- Mental Health Clinics, Portland - Treatment Centers
- Mental Health Specialists, Portland - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Portland
- Metal Stampings Manufacturers, Portland
- Methodist Church, Portland
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- Mini & Self Storage, Portland
- Miscellaneous Government, Portland
- Miscellaneous Metal Work Manufacturers, Portland
- Miscellaneous Personal Services, Portland
- Miscellaneous Professional, Portland
- Mobile Home Parks & Communities , Portland
- Motor Vehicle, Portland
- Motor Vehicle Rental & Leasing, Portland
- Moving Truck Rental , Portland
- Muffler Shop & Exhaust Systems, Portland
- Music, Portland
- Musical Instrument Rental, Portland - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Portland
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