- Machinery And Equipment Manufacturers, Umatilla
- Machinery Custom Design Manufacturers, Umatilla
- Machinery, Supplies & Equipment - Business Production Related, Umatilla
- Machinery, Supplies & Equipment - Construction & Contractor Related, Umatilla
- Management Consultants & Services, Umatilla
- Manicurists & Pedicurists, Umatilla
- Manufacturing, Umatilla
- Marine Contractors & Designers, Umatilla
- Market Research & Analysis , Umatilla - Market Analysis, Business & Economic Research
- Masonry Contractors, Umatilla - Stone Mason, Brick Mason - Install & Repair
- Massage Therapy, Umatilla
- Medical & Dental Management, Umatilla
- Medical Management & Business Administration Service, Umatilla
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- Metal Repair Service & Blacksmith, Umatilla - Iron Works
- Miscellaneous Business Product Repair, Umatilla
- Miscellaneous Government, Umatilla
- Miscellaneous Manufacturing, Umatilla
- Miscellaneous Personal Services, Umatilla
- Miscellaneous Professional, Umatilla
- Mobile Home Parks & Communities , Umatilla
- Mortgage Bankers & Correspondents, Umatilla
- Motor Vehicle, Umatilla
- Motor Vehicle Rental & Leasing, Umatilla
- Motorcycle & Motor Scooters Dealers, Repair & Service, Umatilla
- Motorcycle Repair & Service, Umatilla
- Moving Truck Rental , Umatilla
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