- Machine Parts Metal Manufacturers, Portland
- Machine Shop, Portland
- Machine Shop & Tool Repair Service, Portland
- Machine Shop Rotary Surface Grinding, Portland - Tool Grinding & Sharpening
- Machine Shops Slings, Portland
- Machine Tool Repair & Rebuild, Portland
- Machine Tools , Portland
- Machinery And Equipment Manufacturers, Portland
- Machinery Custom Design Manufacturers, Portland
- Machinery Repair & Rebuild, 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
- Magazine Ads, Portland - Periodical Advertising
- Magazine Printing & Publishing, Portland
- Magicians & Hypnotist Entertainers, Portland
- Magicians & Jugglers Equipment & Supplies, Portland
- Magnetic Devices, Portland
- Magnets & Magnetic Devices, Portland
- Mail Delivery Service, Portland
- Mailbox Rental Services, Portland
- Mailboxes Retail, Portland
- Mailing List Service, Brokers & Compilers, Portland
- Mailing, Delivery & Courier Service, Portland
- Maintenance, Cleaning & Sanitation, Portland
- Major Appliance Parts, Portland
- Major Appliances, Portland - Household & Kitchen
- Make Up & Cosmetics Application, Portland
- Malls & Shopping Centers, Portland
- Malpractice Attorneys & Lawyers, Portland
- Malpractice Attorneys & Lawyers, Portland
- Malpractice Lawyers & Attorneys, Portland
- Mammography Clinics, Portland - Breast Cancer Screening
- Management Consultants & Services, Portland
- Management Training & Development, Portland
- Mandarin Restaurants, 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
- Manufacturing Services, Portland
- Map Publishers & Printers, Portland
- Mapping & Topographical Services, Portland
- Maps & Globes, Portland
- Maps & Supplies, Portland
- Marble, Portland
- Marble Contractors, Portland - Installation, Cleaning & Removal Services
- Marble Tile, Portland
- Marinas & Aquariums, Portland
- Marinas & Marina Services, Portland
- Marine & Lake Services, Portland
- Marine Cleaning & Detailing, Portland
- Marine Contractors & Designers, Portland
- Marine Electronic Equipment, Portland
- Marine Engineers, Portland
- Marine Pilot & Operator Service, Portland
- Marine Products And Services, Portland
- Marine Salvage & Wrecking Services, Portland
- Marine Services, Portland
- Marine Supplies & Equipment, Portland - Boat Supplies
- Marine Surveyors & Adjustors, Portland
- Marionettes & Puppets, Portland
- Market Research & Analysis , Portland - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, Portland
- Marketing Schools, Portland
- Markets & Grocers Equipment, Portland
- Marriage & Family Counselors, Portland
- Marriage Certificates, Portland
- Martial Arts & Self Defense Schools, Portland
- Masonry Contractors, Portland - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Portland
- Mass Transit Vehicle Dealers, Portland
- Massage Equipment & Supplies, Portland
- Massage Parlor & Steam Bath Services, Portland
- Massage Therapists & Professional, Portland
- Massage Therapy, Portland
- Massage Therapy Relaxation, Portland
- Mastectomy Apparel, Forms, Prostheses & Supplies, Portland
- Material Handling, Portland
- Material Handling & Heavy Machinery & Equipment, Portland
- Material Handling Equipment, Portland - Conveyor Belt, Pallet Jack, Forklift, etc
- Maternity Clothes & Clothing Stores, Portland - Maternity Dress, Gown, Swimwear, Underwear & More
- Mathematicians, Portland
- Mats & Matting, Portland
- Mattress & Bedspring Manufacturers, Portland
- Mausoleums Developers, Portland
- Meat Brokers, Portland
- Meat Cutting Services, Portland
- Meat Market, Wholesale & Products, Portland
- Meat Packers, Portland
- Mechanical Contractors, Portland - Install, Service & Repair
- Mechanical Engineer, Portland - Mechanical Engineering Service
- Mechanical Seals, Portland
- Medical & Dental Management, Portland
- Medical & Dental Photographers, Portland
- Medical & Health Service Organizations, Portland
- Medical Alert Systems, Portland - Medical Alarms - PERS
- Medical Attorneys & Lawyers, Portland
- Medical Attorneys & Lawyers, Portland
- Medical Billing Services, Portland
- Medical Business Management Services, Portland
- Medical Claims Processing & Assistance, Portland
- Medical Diagnostic Clinics, Portland - Clinical Labs & Centers
- Medical Diagnostic Imaging, Portland
- Medical Equipment Manufacturers, Portland
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Portland
- Medical Groups & Clinics, Portland - Medical & Health Centers
- Medical Lawyers & Attorneys, Portland
- Medical Management & Business Administration Service, Portland
- Medical Records Service , Portland
- Medical Research, Portland
- Medical Research & Development, Portland - Medical Information & Research
- Medical Supplements, Portland
- Medical Supplies & Equipment, Portland
- Medical Supplies Canes, Portland
- Medical Transcription Service, Portland
- Mediterranean Restaurants, Portland
- Meeting & Event Planning Services, Portland - Conference Consultants
- Membership Sports & Recreation Clubs, Portland
- Men's & Boys Clothing & Accessories Stores, Portland
- Men's Clothing Stores, Portland - Clothes & Accessories
- Men's Shoe Stores, Portland
- Mennonite Church, Portland
- Mens & Boys Belts & Suspenders, Portland
- Mens & Boys Hats, Gloves & Neckwear, Portland
- Mens & Boys Jeans & Western Wear Stores, Portland
- Mens & Womens Clothing, Portland
- Mental & Developmental Information & Referral Services, Portland
- Mental Health Clinics, Portland - Treatment Centers
- Mental Health Specialists, Portland - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Portland
- Merchandising & Pricing Equipment, Portland
- Merger & Acquisition Services, Portland
- Messenger Service, Portland - Message Receiving & Forwarding Service
- Metal Buildings, Portland - Kits, Homes, Steel Buildings, etc
- Metal Cleaning & Pickling, Portland
- Metal Coating & Allied Services, Portland
- Metal Cutting Services, Portland
- Metal Detecting Equipment, Portland
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- Metal Distributors, Portland
- Metal Finishers, Portland
- Metal Galvanizing, Portland
- Metal Goods Alloys, Portland
- Metal Heat Treating, Portland
- Metal Perforating & Punching, Portland
- Metal Plating & Polishing, Portland
- Metal Polishing & Buffing, Portland
- Metal Products, Portland
- Metal Repair Service & Blacksmith, Portland - Iron Works
- Metal Roll Forming Manufacturers, Portland
- Metal Seals, Portland
- Metal Services, Portland
- Metal Specialties, Portland
- Metal Stampings Manufacturers, Portland
- Metal Supplies, Portland
- Metal Tanks, Portland
- Metal Working Machinery, Portland
- Metallurgical Testing Labs, Portland
- Metals, Portland
- Metaphysical Churches, Portland
- Methodist Church, Portland
- Mexican & Latin American Goods & Products Stores, Portland
- Mexican Food, Portland
- Mexican Food & Goods Products, Portland
- Mexican Restaurants, Portland
- Microfilm & Imaging Service, Equipment & Supplies , Portland
- Microwave Oven Repair & Service, Portland
- Middle Eastern Restaurants, Portland
- Midwives, Portland
- Mildew Removal & Control, Portland - Mold Removal
- Military Supplies, Portland
- Millwork Contractors, Portland
- Mind-Body Massage, Portland
- Mini & Self Storage, Portland
- Mini Golf Courses, Portland
- Mining, Portland
- Mining Development & Exploration, Portland
- Mining Equipment & Supplies, Portland
- Mining Equipment & Supplies Service & Repair, Portland
- Mining Services, Portland
- Ministries Church, Portland
- Mirrors, Portland - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Credit Institutions & Services, Portland
- Miscellaneous Business Manufacturing, Portland
- Miscellaneous Business Product Repair, Portland
- Miscellaneous Fabricated Wire Products Manufacturers, Portland
- Miscellaneous Household Item Repair, Portland
- Miscellaneous Retail Stores, Portland
- Miscellaneous Agriculture, Portland
- Miscellaneous Business Services, Portland
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Portland
- Miscellaneous Government, Portland
- Miscellaneous Industry, Portland
- Miscellaneous Jewelry, Portland
- Miscellaneous Manufacturing, Portland
- Miscellaneous Metal Work Manufacturers, Portland
- Miscellaneous Motor Vehicles, Portland
- Miscellaneous Personal Services, Portland
- Miscellaneous Photographers, Portland
- Miscellaneous Professional, Portland
- Miscellaneous Recreational Facilities, Portland
- Miscellaneous Toys & Supplies, Portland
- Mission Churches, Portland
- Mobile Automobile Services, Portland
- Mobile Home Contractors, Portland
- Mobile Home Improvements & Repairs, Portland
- Mobile Home Parks & Communities , Portland
- Modeling & Talent Agencies, Portland
- Modular & Mobile Homes For Sale, Portland - Manufactured Homes Sale & Service
- Modular Buildings, Portland - Modular Homes Buildings & Offices
- Moldings Materials, Portland
- Molds, Portland
- Money Counting & Wrapping, Portland
- Money Transfer Service, Portland
- Mongolian Restaurants, Portland
- Monuments, Tombstones, Markers & Memorials, Portland
- Mopeds & Motor Scooters Rental, Portland
- Mopeds, Scooter & Mini-Bikes Parts, Accessories & Dealers, Portland
- Moroccan Restaurants, Portland
- Mortgage Bankers & Correspondents, Portland
- Mortgage Brokers, Portland
- Mortgage Companies, Portland
- Mortgage Contracts & Services, Portland
- Mortgage Feasibility Consultants, Portland
- Mortgage Loan Processors, Portland
- Mortgages & Loans, Portland
- Mosques, Portland
- Motion Picture & Television Production Services, Portland
- Motion Picture Dists Exchanges & Representatives, Portland
- Motion Picture Equipment & Supplies Rent, Portland
- Motion Picture Personnel Services, Portland
- Motion Picture Pre & Post Production Services, Portland
- Motion Picture Support Services, Portland
- Motion Pictures Video Tape Duplication & Transfer Services, Portland
- Motivational Speakers & Consultants, Portland - Speakers, Lectures & Seminars
- Motor Homes, Portland
- Motor Sports, Portland
- Motor Vehicle, Portland
- Motor Vehicle Rental & Leasing, Portland
- Motorcycle & ATV Repair & Service, Portland
- Motorcycle Driving School, Portland
- Motorcycle Parts, Accessories & Dealers, Portland
- Motorcycle Repair & Service, Portland
- Motorcycles Bicycles & Parts, Portland
- Motorized Bicycle & Scooter, Portland
- Mountain & Rock Climbing Equipment, Portland
- Mountain & Rock Climbing Instruction, Portland
- Movie Advertising, Portland
- Movie Theaters, Portland
- Moving & Storage Consultants, Portland
- Moving & Storage Supplies & Equipment, Portland
- Moving Boxes & Supplies, Portland
- Moving Companies, Portland
- Moving Services - Labor & Material, Portland
- Moving Supplies & Equipment Rental, Portland
- Moving Truck Rental , Portland
- Muffler & Exhaust Systems Wholesale, Portland
- Muffler Shop & Exhaust Systems, Portland
- Mufflers & Exhaust Systems Manufacturers, Portland
- Multimedia Publishers, Portland - Multimedia Services & Systems
- Murals & Faux Finish Walls, Portland
- Museums, Portland
- Music, Portland
- Music Distribution, Portland
- Music Entertainment, Portland
- Music Lessons, Portland
- Music Lessons - Instrumental, Portland
- Music Live & Pre Recorded, Portland
- Music Publishers & Distribution, Portland
- Music Schools, Portland
- Music Sheet, Portland
- Music Stores Retail, Portland
- Music Therapy, Portland
- Musical Instrument Manufacturers, Portland
- Musical Instrument Rental, Portland - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Portland
- Musical Instruments - Guitars, Portland
- Musical Instruments - Violins, Portland
- Musical Instruments Repair, Sales & Service, Portland
- Musical Recording Services, Portland
- Musicians, Bands & Disc Jockeys, Portland
- Muslim Church, Portland
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