- Machine Shop & Tool Repair Service, Portland
- Machinery And Equipment Manufacturers, Portland
- Machinery, Supplies & Equipment - Business Supplies Related, Portland
- Magazine & Newspaper Stands, Portland - Dealers & Distributors
- Maintenance, Cleaning & Sanitation, 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 Products, Portland
- Manufacturing Services, Portland
- Marriage & Family Counselors, Portland
- Martial Arts & Self Defense Schools, Portland
- Masonry Contractors, Portland - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Portland
- Material Handling Equipment, Portland - Conveyor Belt, Pallet Jack, Forklift, etc
- Mechanical Contractors, Portland - Install, Service & Repair
- Medical Diagnostic Clinics, Portland - Clinical Labs & Centers
- Membership Sports & Recreation Clubs, Portland
- Metal Buildings, Portland - Kits, Homes, Steel Buildings, etc
- Metal Buildings Prefabricated Manufacturers, Portland
- Metal Finishers, Portland
- Metal Plating & Polishing, Portland
- Metal Stampings Manufacturers, Portland
- Methodist Church, Portland
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- Mexican Restaurants, Portland
- Mini & Self Storage, Portland
- Mining, Portland
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Portland
- Miscellaneous Government, Portland
- Miscellaneous Manufacturing, Portland
- Miscellaneous Metal Work Manufacturers, Portland
- Miscellaneous Personal Services, Portland
- Miscellaneous Photographers, Portland
- Miscellaneous Professional, Portland
- Modular & Mobile Homes For Sale, Portland - Manufactured Homes Sale & Service
- Molds, Portland
- Motor Vehicle, Portland
- Motor Vehicle Rental & Leasing, Portland
- Moving Truck Rental , Portland
- Mulch, Peat & Moss Products, Portland
- Music, Portland
- Music Entertainment, Portland
- Music Lessons, Portland
- Music Lessons - Instrumental, Portland
- Musical Instrument Rental, Portland - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Portland
- Musical Instruments - Violins, Portland
- Musical Instruments Repair, Sales & Service, Portland
- Musical Recording Services, Portland
- Musicians, Bands & Disc Jockeys, Portland
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