- Machine Shop & Tool Repair Service, Niwot
- Machinery, Supplies & Equipment - Business Production Related, Niwot
- Machinery, Supplies & Equipment - Business Supplies Related, Niwot
- Management Consultants & Services, Niwot
- Manicurists & Pedicurists, Niwot
- Manufacturers Agents & Representatives, Niwot
- Manufacturers Representative, Niwot - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Niwot
- Massage Therapists & Professional, Niwot
- Massage Therapy, Niwot
- Medical & Dental Management, Niwot
- Medical & Health Service Organizations, Niwot
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- Mexican Restaurants, Niwot
- Miscellaneous Household Item Repair, Niwot
- Miscellaneous Government, Niwot
- Miscellaneous Manufacturing, Niwot
- Miscellaneous Personal Services, Niwot
- Miscellaneous Professional, Niwot
- Motion Pictures Video Tape Duplication & Transfer Services, Niwot
- Motor Vehicle, Niwot
- Moving Companies, Niwot
- Music, Niwot
- Musical Instrument Rental, Niwot - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Niwot
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