- Machine Shop & Tool Repair Service, Littleton
- Machinery, Supplies & Equipment - Business Supplies Related, Littleton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Littleton
- Mailing, Delivery & Courier Service, Littleton
- Major Appliances, Littleton - Household & Kitchen
- Management Consultants & Services, Littleton
- Manicurists & Pedicurists, Littleton
- Manufacturing, Littleton
- Marriage & Family Counselors, Littleton
- Martial Arts & Self Defense Schools, Littleton
- Masonry Contractors, Littleton - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Littleton
- Medical Diagnostic Clinics, Littleton - Clinical Labs & Centers
- Medical Research, Littleton
- Medical Research & Development, Littleton - Medical Information & Research
- Medical Supplies & Equipment, Littleton
- Mental Health Specialists, Littleton - Psychologist, Psychiatrist, Psychotherapist, etc
- Metaphysical Churches, Littleton
- Millwork Contractors, Littleton
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- Miscellaneous Business Services, Littleton
- Miscellaneous Personal Services, Littleton
- Miscellaneous Photographers, Littleton
- Miscellaneous Professional, Littleton
- Mobile Home Parks & Communities , Littleton
- Mortgage Bankers & Correspondents, Littleton
- Motion Picture & Television Production Services, Littleton
- Motion Picture Dists & Producers, Littleton
- Motor Vehicle, Littleton
- Motor Vehicle Rental & Leasing, Littleton
- Moving & Storage Consultants, Littleton
- Moving Companies, Littleton
- Moving Supplies & Equipment Rental, Littleton
- Moving Truck Rental , Littleton
- Music, Littleton
- Music Lessons, Littleton
- Music Lessons - Instrumental, Littleton
- Musical Instrument Rental, Littleton - Band & Orchestra Instruments
- Musical Instruments Repair, Sales & Service, Littleton
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