- Machine Shop & Tool Repair Service, Humboldt
- Machinery, Supplies & Equipment - Business Production Related, Humboldt
- Machinery, Supplies & Equipment - Business Supplies Related, Humboldt
- Machinery, Supplies & Equipment - Construction & Contractor Related, Humboldt
- Mail Delivery Service, Humboldt
- Major Appliances, Humboldt - Household & Kitchen
- Manufacturing, Humboldt
- Manufacturing Products, Humboldt
- Marine Supplies & Equipment, Humboldt - Boat Supplies
- Marriage & Family Counselors, Humboldt
- Masonry Materials & Supplies, Humboldt
- Medical Supplies & Equipment, Humboldt
- Meeting & Event Planning Services, Humboldt - Conference Consultants
- Membership Sports & Recreation Clubs, Humboldt
- Men's & Boys Clothing & Accessories Stores, Humboldt
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- Mens & Boys Jeans & Western Wear Stores, Humboldt
- Merchandise Sales Events, Humboldt
- Methodist Church, Humboldt
- Mexican Restaurants, Humboldt
- Miscellaneous Government, Humboldt
- Miscellaneous Personal Services, Humboldt
- Miscellaneous Photographers, Humboldt
- Miscellaneous Professional, Humboldt
- Mortgages & Loans, Humboldt
- Motion Picture Pre & Post Production Services, Humboldt
- Motor Vehicle, Humboldt
- Motor Vehicle Rental & Leasing, Humboldt
- Motorcycle Parts, Accessories & Dealers, Humboldt
- Movie Theaters, Humboldt
- Moving Truck Rental , Humboldt
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