- Machine Shop & Tool Repair Service, Portland
- Machinery And Equipment Manufacturers, Portland
- Machinery, Supplies & Equipment - Business Production Related, Portland
- Machinery, Supplies & Equipment - Business Supplies Related, Portland
- Machinery, Supplies & Equipment - Construction & Contractor Related, Portland
- Magazine & Newspaper Stands, Portland - Dealers & Distributors
- Magicians & Hypnotist Entertainers, Portland
- Mail Delivery Service, Portland
- Mailbox Rental Services, Portland
- Mailing, Delivery & Courier Service, Portland
- Maintenance, Cleaning & Sanitation, Portland
- Major Appliance Repair & Service, Portland
- Major Appliances, Portland - Household & Kitchen
- Malpractice Attorneys & Lawyers, Portland
- Malpractice Attorneys & Lawyers, Portland
- Malpractice Lawyers & Attorneys, Portland
- Management Consultants & Services, Portland
- Manicurists & Pedicurists, Portland
- Manifold Business Forms Manufacturers, Portland
- Manufacturers Agents & Representatives, Portland
- Manufacturers Representative, Portland - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Portland
- Manufacturing & Industrial Consultants, Portland
- Manufacturing Equipment & Supplies, Portland
- Manufacturing Products, Portland
- Map Publishers & Printers, Portland
- Mapping & Topographical Services, Portland
- Marble, Portland
- Marinas & Marina Services, Portland
- Marine Animals & Fish, Portland
- Marine Electronic Equipment, Portland
- Marine Pilot & Operator Service, Portland
- Marine Products And Services, Portland
- Marine Repair & Service Stations, Portland
- Marine Services, Portland
- Marine Supplies & Equipment, Portland - Boat Supplies
- Marine Supplies & Equipment Repair, Portland - Boat Supplies & Equipment
- Market Research & Analysis , Portland - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, Portland
- Marriage & Family Counselors, Portland
- Marriage & Family Counselors Information & Referrals, Portland
- Martial Arts & Self Defense Schools, Portland
- Masonry Contractors, Portland - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Portland
- Massage Therapists & Professional, Portland
- Massage Therapy, Portland
- Material Handling & Heavy Machinery & Equipment, Portland
- Mattress & Bedspring Manufacturers, Portland
- Meat Market, Wholesale & Products, Portland
- Mechanical Contractors, Portland - Install, Service & Repair
- Mechanical Engineer, Portland - Mechanical Engineering Service
- Medical Equipment Manufacturers, Portland
- Medical Products & Equipment, Portland
- Medical Research, Portland
- Medical Research & Development, Portland - Medical Information & Research
- Medical Supplements, Portland
- Medical Supplies & Equipment, Portland
- Meeting & Event Planning Services, Portland - Conference Consultants
- Membership Sports & Recreation Clubs, Portland
- Men's Clothing Stores, Portland - Clothes & Accessories
- Mental Health Specialists, Portland - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Portland
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- Merchandise Sales Events, Portland
- Metal Buildings, Portland - Kits, Homes, Steel Buildings, etc
- Metal Detecting Equipment, Portland
- Metal Products, Portland
- Metaphysical Churches, Portland
- Methodist Church, Portland
- Mexican Food & Goods Products, Portland
- Mexican Restaurants, Portland
- Middle Eastern Restaurants, Portland
- Midwives, Portland
- Mildew Removal & Control, Portland - Mold Removal
- Military Supplies, Portland
- Millwork Contractors, Portland
- Mini & Self Storage, Portland
- Mining, Portland
- Miscellaneous Business Credit Institutions & Services, Portland
- Miscellaneous Business Product Repair, Portland
- Miscellaneous Household Item Repair, Portland
- Miscellaneous Business Services, Portland
- Miscellaneous Government, Portland
- Miscellaneous Manufacturing, Portland
- Miscellaneous Personal Services, Portland
- Miscellaneous Photographers, Portland
- Miscellaneous Professional, Portland
- Modeling & Talent Agencies, Portland
- Monuments, Tombstones, Markers & Memorials, Portland
- Mopeds, Scooter & Mini-Bikes Parts, Accessories & Dealers, Portland
- Mortgage Bankers & Correspondents, Portland
- Mortgage Companies, Portland
- Mortgages & Loans, Portland
- Mortgages Commercial & Industrial, Portland
- Motion Picture & Television Production Services, Portland
- Motion Picture Dists & Producers, Portland
- Motion Picture Equipment & Supplies, Portland
- Motion Picture Pre & Post Production Services, Portland
- Motivational & Self Improvement Schools, Portland
- Motor Vehicle, Portland
- Motor Vehicle Rental & Leasing, Portland
- Motorcycle & Motor Scooters Dealers, Repair & Service, Portland
- Motorcycle Parts, Accessories & Dealers, Portland
- Motorcycle Repair & Service, Portland
- Movie Theaters, Portland
- Moving & Storage Supplies & Equipment, Portland
- Moving Companies, Portland
- Moving Supplies & Equipment Rental, Portland
- Moving Truck Rental , Portland
- Muffler Shop & Exhaust Systems, Portland
- Multimedia Publishers, Portland - Multimedia Services & Systems
- Museums, Portland
- Music, Portland
- Music Entertainment, Portland
- Music Lessons, Portland
- Music Lessons - Instrumental, Portland
- Music Lessons - Vocal, Portland
- Music Management, Portland
- Musical Instrument Manufacturers, Portland
- Musical Instruments & Equipment Stores, Portland
- Musical Instruments Repair, Sales & Service, Portland
- Musical Instruments Supplies & Accessories Manufacturers, Portland
- Musical Recording Services, Portland
- Musicians, Bands & Disc Jockeys, Portland
- Myofunctional Therapy, Portland
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