- Machine Shop, Oroville
- Machine Shop & Tool Repair Service, Oroville
- Machinery, Supplies & Equipment - Business Production Related, Oroville
- Machinery, Supplies & Equipment - Business Supplies Related, Oroville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Oroville
- Magicians & Hypnotist Entertainers, Oroville
- Magnetic & Optical Recording Media Manufacturers, Oroville
- Mailbox Rental Services, Oroville
- Mailing, Delivery & Courier Service, Oroville
- Major Appliances, Oroville - Household & Kitchen
- Manicurists & Pedicurists, Oroville
- Manufacturing, Oroville
- Manufacturing Products, Oroville
- Manufacturing Services, Oroville
- Marinas & Marina Services, Oroville
- Marine Supplies & Equipment, Oroville - Boat Supplies
- Marriage & Family Counselors, Oroville
- Masonry Contractors, Oroville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Oroville
- Massage Therapists & Professional, Oroville
- Massage Therapy, Oroville
- Maytag Appliances, Oroville
- Meat Market, Wholesale & Products, Oroville
- Medical Diagnostic Clinics, Oroville - Clinical Labs & Centers
- Medical Supplies & Equipment, Oroville
- Membership Sports & Recreation Clubs, Oroville
- Mennonite Church, Oroville
- Mental Health Specialists, Oroville - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Detecting Equipment, Oroville
- Metal Plating & Polishing, Oroville
- Metal Products, Oroville
- Metal Roofs, Oroville
- Metal Specialties, Oroville
- Metaphysical Churches, Oroville
- Methodist Church, Oroville
- Mexican Restaurants, Oroville
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- Millwork Manufacturers, Oroville
- Minerals, Oroville
- Mini & Self Storage, Oroville
- Mining Equipment & Supplies, Oroville
- Mirrors, Oroville - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Agriculture, Oroville
- Miscellaneous Business Services, Oroville
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Oroville
- Miscellaneous Government, Oroville
- Miscellaneous Manufacturing, Oroville
- Miscellaneous Personal Services, Oroville
- Miscellaneous Photographers, Oroville
- Miscellaneous Professional, Oroville
- Mobile Home Parks & Communities , Oroville
- Modular & Mobile Homes For Sale, Oroville - Manufactured Homes Sale & Service
- Modular Buildings, Oroville - Modular Homes Buildings & Offices
- Monuments, Tombstones, Markers & Memorials, Oroville
- Mortgage Companies, Oroville
- Mortgages & Loans, Oroville
- Mosquito Control, Oroville
- Motor Homes, Oroville
- Motor Vehicle, Oroville
- Motor Vehicle Rental & Leasing, Oroville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Oroville
- Motorcycle Parts, Accessories & Dealers, Oroville
- Motorcycle Repair & Service, Oroville
- Movie Theaters, Oroville
- Moving & Storage Supplies & Equipment, Oroville
- Moving Supplies & Equipment Rental, Oroville
- Moving Truck Rental , Oroville
- Muffler Shop & Exhaust Systems, Oroville
- Museums, Oroville
- Music, Oroville
- Music Lessons, Oroville
- Music Lessons - Instrumental, Oroville
- Musical Instruments & Equipment Stores, Oroville
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