- Machine Shop, Healdsburg
- Machine Shop & Tool Repair Service, Healdsburg
- Machinery, Supplies & Equipment - Business Production Related, Healdsburg
- Machinery, Supplies & Equipment - Business Supplies Related, Healdsburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Healdsburg
- Magazine & Newspaper Stands, Healdsburg - Dealers & Distributors
- Mailbox Rental Services, Healdsburg
- Mailing, Delivery & Courier Service, Healdsburg
- Management Consultants & Services, Healdsburg
- Manicurists & Pedicurists, Healdsburg
- Manufacturers Agents & Representatives, Healdsburg
- Manufacturers Representative, Healdsburg - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Healdsburg
- Manufacturing Products, Healdsburg
- Manufacturing Services, Healdsburg
- Marriage & Family Counselors, Healdsburg
- Masonry Contractors, Healdsburg - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Healdsburg
- Massage Therapists & Professional, Healdsburg
- Massage Therapy, Healdsburg
- Mausoleums Developers, Healdsburg
- Medical & Infectious Waste Disposal, Healdsburg
- Medical Supplies & Equipment, Healdsburg
- Meeting & Event Planning Services, Healdsburg - Conference Consultants
- Membership Sports & Recreation Clubs, Healdsburg
- Men's Clothing Stores, Healdsburg - Clothes & Accessories
- Mental Health Specialists, Healdsburg - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Marketing Consultants, Healdsburg
- Metal Repair Service & Blacksmith, Healdsburg - Iron Works
- Mexican & Latin American Goods & Products Stores, Healdsburg
- Mexican Restaurants, Healdsburg
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- Middle Eastern Restaurants, Healdsburg
- Mini & Self Storage, Healdsburg
- Miscellaneous Business Services, Healdsburg
- Miscellaneous Government, Healdsburg
- Miscellaneous Industry, Healdsburg
- Miscellaneous Manufacturing, Healdsburg
- Miscellaneous Personal Services, Healdsburg
- Miscellaneous Professional, Healdsburg
- Mortgage Bankers & Correspondents, Healdsburg
- Mortgage Companies, Healdsburg
- Mortgages & Loans, Healdsburg
- Motor Vehicle, Healdsburg
- Motor Vehicle Rental & Leasing, Healdsburg
- Motorcycle & Motor Scooters Dealers, Repair & Service, Healdsburg
- Motorcycle Parts, Accessories & Dealers, Healdsburg
- Motorcycle Repair & Service, Healdsburg
- Motorcycles Paint & Refinishing, Healdsburg
- Movie Theaters, Healdsburg
- Moving & Storage Supplies & Equipment, Healdsburg
- Moving Companies, Healdsburg
- Moving Services - Labor & Material, Healdsburg
- Moving Truck Rental , Healdsburg
- Muffler Shop & Exhaust Systems, Healdsburg
- Museums, Healdsburg
- Music, Healdsburg
- Music Entertainment, Healdsburg
- Musical Instrument Manufacturers, Healdsburg
- Musical Instruments & Equipment Stores, Healdsburg
- Musical Recording Services, Healdsburg
- Musicians, Bands & Disc Jockeys, Healdsburg
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