- Machine Shop, Fortuna
- Machinery And Equipment Manufacturers, Fortuna
- Machinery, Supplies & Equipment - Business Production Related, Fortuna
- Machinery, Supplies & Equipment - Business Supplies Related, Fortuna
- Machinery, Supplies & Equipment - Construction & Contractor Related, Fortuna
- Mammography Clinics, Fortuna - Breast Cancer Screening
- Management Consultants & Services, Fortuna
- Manicurists & Pedicurists, Fortuna
- Manufacturing, Fortuna
- Manufacturing Products, Fortuna
- Marriage & Family Counselors, Fortuna
- Martial Arts & Self Defense Schools, Fortuna
- Masonry Contractors, Fortuna - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Fortuna
- Massage Therapists & Professional, Fortuna
- Massage Therapy, Fortuna
- Meat Market, Wholesale & Products, Fortuna
- Meeting & Event Planning Services, Fortuna - Conference Consultants
- Membership Sports & Recreation Clubs, Fortuna
- Mental Health Specialists, Fortuna - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Fortuna - Iron Works
- Metal Roofs, Fortuna
- Meteorologists, Fortuna
- Methodist Church, Fortuna
- Mexican Food, Fortuna
- Mexican Restaurants, Fortuna
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- Midwives, Fortuna
- Mini & Self Storage, Fortuna
- Mining, Fortuna
- Miscellaneous Business Services, Fortuna
- Miscellaneous Government, Fortuna
- Miscellaneous Industry, Fortuna
- Miscellaneous Personal Services, Fortuna
- Miscellaneous Professional, Fortuna
- Mobile Home Parks & Communities , Fortuna
- Modular Buildings, Fortuna - Modular Homes Buildings & Offices
- Monuments, Tombstones, Markers & Memorials, Fortuna
- Mortgage Bankers & Correspondents, Fortuna
- Mortgage Companies, Fortuna
- Mortgages & Loans, Fortuna
- Morticians & Mortician Services, Fortuna
- Motor Vehicle, Fortuna
- Motor Vehicle Rental & Leasing, Fortuna
- Motorcycle & Motor Scooters Dealers, Repair & Service, Fortuna
- Motorcycle Repair & Service, Fortuna
- Movie Theaters, Fortuna
- Moving Truck Rental , Fortuna
- Muffler Shop & Exhaust Systems, Fortuna
- Museums, Fortuna
- Music, Fortuna
- Music Lessons, Fortuna
- Music Lessons - Instrumental, Fortuna
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