- Machinery, Supplies & Equipment - Business Production Related, Vail
- Machinery, Supplies & Equipment - Construction & Contractor Related, Vail
- Manicurists & Pedicurists, Vail
- Manufacturing, Vail
- Masonry Materials & Supplies, Vail
- Medical Research, Vail
- Medical Research & Development, Vail - Medical Information & Research
- Membership Sports & Recreation Clubs, Vail
- Mexican Restaurants, Vail
- Mini & Self Storage, Vail
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- Mining, Vail
- Mining Contractors, Vail - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Vail - Mining Companies
- Miscellaneous Household Item Repair, Vail
- Miscellaneous Government, Vail
- Motor Vehicle, Vail
- Motor Vehicle Rental & Leasing, Vail
- Moving Companies, Vail
- Moving Supplies & Equipment Rental, Vail
- Moving Truck Rental , Vail
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