- Machine Shop, Watsonville
- Machine Shop & Tool Repair Service, Watsonville
- Machinery Movers & Erectors, Watsonville
- Machinery, Supplies & Equipment - Business Production Related, Watsonville
- Machinery, Supplies & Equipment - Business Supplies Related, Watsonville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Watsonville
- Magazine Printing & Publishing, Watsonville
- Mailbox Rental Services, Watsonville
- Mailing, Delivery & Courier Service, Watsonville
- Maintenance, Cleaning & Sanitation, Watsonville
- Major Appliance Repair & Service, Watsonville
- Major Appliances, Watsonville - Household & Kitchen
- Make Up & Cosmetics Application, Watsonville
- Malls & Shopping Centers, Watsonville
- Management Consultants & Services, Watsonville
- Manicurists & Pedicurists, Watsonville
- Manufacturers Agents & Representatives, Watsonville
- Manufacturers Representative, Watsonville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Watsonville
- Manufacturing Products, Watsonville
- Marble, Watsonville
- Marine Engineers, Watsonville
- Marine Pilot & Operator Service, Watsonville
- Marine Supplies & Equipment, Watsonville - Boat Supplies
- Marriage & Family Counselors, Watsonville
- Martial Arts & Self Defense Schools, Watsonville
- Masonry Materials & Supplies, Watsonville
- Massage Equipment & Supplies, Watsonville
- Massage Therapists & Professional, Watsonville
- Massage Therapy, Watsonville
- Meat Cutting Services, Watsonville
- Meat Market, Wholesale & Products, Watsonville
- Mechanical Engineer, Watsonville - Mechanical Engineering Service
- Medical Equipment Manufacturers, Watsonville
- Medical Research Facilities, Watsonville - Research & Development Centers
- Medical Supplies & Equipment, Watsonville
- Melons, Watsonville
- Membership Sports & Recreation Clubs, Watsonville
- Men's & Boys Clothing & Accessories Stores, Watsonville
- Men's Clothing Stores, Watsonville - Clothes & Accessories
- Mens & Boys Hats, Gloves & Neckwear, Watsonville
- Mens & Boys Jeans & Western Wear Stores, Watsonville
- Mental Health Clinics, Watsonville - Treatment Centers
- Mental Health Specialists, Watsonville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Marketing Consultants, Watsonville
- Metal Repair Service & Blacksmith, Watsonville - Iron Works
- Metal Services, Watsonville
- Metal Windows, Watsonville
- Metal Working Machinery, Watsonville
- Methodist Church, Watsonville
- Mexican & Latin American Goods & Products Stores, Watsonville
- Mexican Food, Watsonville
- Mexican Restaurants, Watsonville
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- Middle Eastern Restaurants, Watsonville
- Mildew Removal & Control, Watsonville - Mold Removal
- Military Supplies, Watsonville
- Mini & Self Storage, Watsonville
- Miniatures Collectors, Watsonville
- Mirrors, Watsonville - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Watsonville
- Miscellaneous Agriculture, Watsonville
- Miscellaneous Business Services, Watsonville
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Watsonville
- Miscellaneous Government, Watsonville
- Miscellaneous Industry, Watsonville
- Miscellaneous Manufacturing, Watsonville
- Miscellaneous Personal Services, Watsonville
- Miscellaneous Photographers, Watsonville
- Miscellaneous Professional, Watsonville
- Mobile Home Contractors, Watsonville
- Mobile Home Improvements & Repairs, Watsonville
- Mobile Home Parks & Communities , Watsonville
- Modular & Mobile Homes For Sale, Watsonville - Manufactured Homes Sale & Service
- Money Counting & Wrapping, Watsonville
- Money Transfer Service, Watsonville
- Monuments, Tombstones, Markers & Memorials, Watsonville
- Mortgage Bankers & Correspondents, Watsonville
- Mortgage Companies, Watsonville
- Mortgages & Loans, Watsonville
- Motion Picture Pre & Post Production Services, Watsonville
- Motion Pictures Video Tape Duplication & Transfer Services, Watsonville
- Motor Vehicle, Watsonville
- Motor Vehicle Rental & Leasing, Watsonville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Watsonville
- Motorcycle Machine Shop Service, Watsonville
- Motorcycle Parts, Accessories & Dealers, Watsonville
- Motorcycle Repair & Service, Watsonville
- Motorcycle Wreckers, Watsonville
- Moving & Storage Supplies & Equipment, Watsonville
- Moving Companies, Watsonville
- Moving Services - Labor & Material, Watsonville
- Moving Truck Rental , Watsonville
- Mowing Service, Watsonville
- Muffler Shop & Exhaust Systems, Watsonville
- Museums, Watsonville
- Music, Watsonville
- Music Distribution, Watsonville
- Music Entertainment, Watsonville
- Music Lessons, Watsonville
- Music Lessons - Instrumental, Watsonville
- Musical Instrument Manufacturers, Watsonville
- Musical Instruments & Equipment Stores, Watsonville
- Musical Instruments Repair, Sales & Service, Watsonville
- Musical Recording Services, Watsonville
- Musicians, Bands & Disc Jockeys, Watsonville
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