- Machinery, Supplies & Equipment - Business Production Related, Yountville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Yountville
- Major Appliances, Yountville - Household & Kitchen
- Malls & Shopping Centers, Yountville
- Management Consultants & Services, Yountville
- Manicurists & Pedicurists, Yountville
- Manufacturing, Yountville
- Massage Therapists & Professional, Yountville
- Massage Therapy, Yountville
- Membership Sports & Recreation Clubs, Yountville
- Men's Clothing Stores, Yountville - Clothes & Accessories
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- Mini & Self Storage, Yountville
- Miscellaneous Business Services, Yountville
- Miscellaneous Government, Yountville
- Mobile Home Parks & Communities , Yountville
- Mortgages & Loans, Yountville
- Motor Vehicle, Yountville
- Museums, Yountville
- Music, Yountville
- Music Entertainment, Yountville
- Music Lessons, Yountville
- Music Lessons - Instrumental, Yountville
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