- Machine Shop & Tool Repair Service, Hermiston
- Machinery, Supplies & Equipment - Business Production Related, Hermiston
- Machinery, Supplies & Equipment - Construction & Contractor Related, Hermiston
- Mailbox Rental Services, Hermiston
- Mailing, Delivery & Courier Service, Hermiston
- Maintenance, Cleaning & Sanitation, Hermiston
- Major Appliances, Hermiston - Household & Kitchen
- Management Consultants & Services, Hermiston
- Manicurists & Pedicurists, Hermiston
- Manufacturing, Hermiston
- Manufacturing Products, Hermiston
- Marine Supplies & Equipment, Hermiston - Boat Supplies
- Marriage & Family Counselors, Hermiston
- Martial Arts & Self Defense Schools, Hermiston
- Masonry Materials & Supplies, Hermiston
- Massage Therapists & Professional, Hermiston
- Massage Therapy, Hermiston
- Meat Cutting Services, Hermiston
- Meat Market, Wholesale & Products, Hermiston
- Meat Packers, Hermiston
- Medical Diagnostic Clinics, Hermiston - Clinical Labs & Centers
- Medical Equipment Manufacturers, Hermiston
- Medical Supplies & Equipment, Hermiston
- Meeting & Event Planning Services, Hermiston - Conference Consultants
- Membership Sports & Recreation Clubs, Hermiston
- Men's & Boys Clothing & Accessories Stores, Hermiston
- Men's Clothing Stores, Hermiston - Clothes & Accessories
- Mens & Boys Jeans & Western Wear Stores, Hermiston
- Mental Health Specialists, Hermiston - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Hermiston
- Metal Buildings, Hermiston - Kits, Homes, Steel Buildings, etc
- Metal Services, Hermiston
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- Methodist Church, Hermiston
- Mexican Restaurants, Hermiston
- Mildew Removal & Control, Hermiston - Mold Removal
- Mining, Hermiston
- Miscellaneous Agriculture, Hermiston
- Miscellaneous Government, Hermiston
- Miscellaneous Industry, Hermiston
- Miscellaneous Personal Services, Hermiston
- Miscellaneous Photographers, Hermiston
- Miscellaneous Professional, Hermiston
- Mobile Home Parks & Communities , Hermiston
- Mobile Homes, Hermiston
- Mobile Homes Manufactures, Hermiston
- Modular & Mobile Homes For Sale, Hermiston - Manufactured Homes Sale & Service
- Money Transfer Service, Hermiston
- Mortgage Bankers & Correspondents, Hermiston
- Mortgage Companies, Hermiston
- Mortgage Contracts & Services, Hermiston
- Mortgages & Loans, Hermiston
- Motor Homes, Hermiston
- Motor Vehicle, Hermiston
- Motor Vehicle Rental & Leasing, Hermiston
- Motorcycle Parts, Accessories & Dealers, Hermiston
- Movie Theaters, Hermiston
- Moving Supplies & Equipment Rental, Hermiston
- Moving Truck Rental , Hermiston
- Muffler Shop & Exhaust Systems, Hermiston
- Music, Hermiston
- Music Entertainment, Hermiston
- Musical Instrument Rental, Hermiston - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Hermiston
- Musicians, Bands & Disc Jockeys, Hermiston
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