- Machine Shop & Tool Repair Service, Portland
- Machinery, Supplies & Equipment - Business Production Related, Portland
- Machinery, Supplies & Equipment - Business Supplies Related, Portland
- Machinery, Supplies & Equipment - Construction & Contractor Related, Portland
- Management Consultants & Services, Portland
- Manicurists & Pedicurists, Portland
- Manufacturers Agents & Representatives, Portland
- Manufacturers Representative, Portland - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Portland
- Manufacturing & Industrial Consultants, Portland
- Manufacturing Products, Portland
- Marine Contractors & Designers, Portland
- Marine Products And Services, Portland
- Marine Repair & Service Stations, Portland
- Marine Supplies & Equipment Repair, Portland - Boat Supplies & Equipment
- Martial Arts & Self Defense Schools, Portland
- Masonry Materials & Supplies, Portland
- Membership Sports & Recreation Clubs, Portland
- Mental Health Clinics, Portland - Treatment Centers
- Methodist Church, Portland
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- Mexican Restaurants, Portland
- Miscellaneous Government, Portland
- Miscellaneous Manufacturing, Portland
- Miscellaneous Personal Services, Portland
- Miscellaneous Photographers, Portland
- Miscellaneous Professional, Portland
- Mobile Home Parks & Communities , Portland
- Modular & Mobile Homes For Sale, Portland - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Portland
- Mortgage Companies, Portland
- Mortgages & Loans, Portland
- Motor Vehicle, Portland
- Motor Vehicle Rental & Leasing, Portland
- Movie Theaters, Portland
- Moving Truck Rental , Portland
- Muffler Shop & Exhaust Systems, Portland
- Museums, Portland
- Music, Portland
- Musical Instruments & Equipment Stores, Portland
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