- Machinery, Supplies & Equipment - Business Production Related, Guerneville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Guerneville
- Mailbox Rental Services, Guerneville
- Mailing Containers Wholesale & Retail, Guerneville
- Management Consultants & Services, Guerneville
- Manufacturing, Guerneville
- Marriage & Family Counselors, Guerneville
- Medical Groups & Clinics, Guerneville - Medical & Health Centers
- Meeting & Event Planning Services, Guerneville - Conference Consultants
- Membership Sports & Recreation Clubs, Guerneville
- Mental Health Clinics, Guerneville - Treatment Centers
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- Mental Health Specialists, Guerneville - Psychologist, Psychiatrist, Psychotherapist, etc
- Mexican Restaurants, Guerneville
- Miscellaneous Business Product Repair, Guerneville
- Miscellaneous Government, Guerneville
- Miscellaneous Manufacturing, Guerneville
- Motor Vehicle, Guerneville
- Motor Vehicle Rental & Leasing, Guerneville
- Moving & Storage Supplies & Equipment, Guerneville
- Moving Companies, Guerneville
- Moving Truck Rental , Guerneville
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