- Machine Shop & Tool Repair Service, Humboldt
- Machinery And Equipment Manufacturers, Humboldt
- Machinery, Supplies & Equipment - Business Production Related, Humboldt
- Machinery, Supplies & Equipment - Business Supplies Related, Humboldt
- Machinery, Supplies & Equipment - Construction & Contractor Related, Humboldt
- Magazine & Newspaper Stands, Humboldt - Dealers & Distributors
- Maintenance, Cleaning & Sanitation, Humboldt
- Major Appliances, Humboldt - Household & Kitchen
- Malls & Shopping Centers, Humboldt
- Management Consultants & Services, Humboldt
- Manicurists & Pedicurists, Humboldt
- Manmade Fiber Finishing Plants, Humboldt
- Manufacturing, Humboldt
- Manufacturing Products, Humboldt
- Marriage & Family Counselors, Humboldt
- Masonry Materials & Supplies, Humboldt
- Massage Therapy, Humboldt
- Medical Supplies & Equipment, Humboldt
- Membership Sports & Recreation Clubs, Humboldt
- Men's Clothing Stores, Humboldt - Clothes & Accessories
- Mental Health Specialists, Humboldt - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Humboldt - Kits, Homes, Steel Buildings, etc
- Mildew Removal & Control, Humboldt - Mold Removal
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- Millwork Contractors, Humboldt
- Miscellaneous Agriculture, Humboldt
- Miscellaneous Government, Humboldt
- Miscellaneous Industry, Humboldt
- Miscellaneous Personal Services, Humboldt
- Miscellaneous Photographers, Humboldt
- Miscellaneous Professional, Humboldt
- Monuments, Tombstones, Markers & Memorials, Humboldt
- Mortgage Bankers & Correspondents, Humboldt
- Motor Vehicle, Humboldt
- Motor Vehicle Rental & Leasing, Humboldt
- Movie Theaters, Humboldt
- Moving Companies, Humboldt
- Moving Truck Rental , Humboldt
- Museums, Humboldt
- Music, Humboldt
- Music Lessons, Humboldt
- Music Lessons - Instrumental, Humboldt
- Music Production Services, Humboldt
- Music Recorded Dance, Humboldt
- Musical Instruments & Equipment Stores, Humboldt
- Musical Recording Services, Humboldt
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