- Machine Shop, South San Francisco
- Machine Shop & Tool Repair Service, South San Francisco
- Machine Tools , South San Francisco
- Machinery And Equipment Manufacturers, South San Francisco
- Machinery, Supplies & Equipment - Business Production Related, South San Francisco
- Machinery, Supplies & Equipment - Business Supplies Related, South San Francisco
- Machinery, Supplies & Equipment - Construction & Contractor Related, South San Francisco
- Magazine & Newspaper Stands, South San Francisco - Dealers & Distributors
- Magnetic & Optical Recording Media Manufacturers, South San Francisco
- Mailbox Rental Services, South San Francisco
- Mailing, Delivery & Courier Service, South San Francisco
- Maintenance, Cleaning & Sanitation, South San Francisco
- Major Appliances, South San Francisco - Household & Kitchen
- Management Consultants & Services, South San Francisco
- Manicurists & Pedicurists, South San Francisco
- Manufacturers Agents & Representatives, South San Francisco
- Manufacturers Representative, South San Francisco - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, South San Francisco
- Manufacturing & Industrial Consultants, South San Francisco
- Manufacturing Equipment & Supplies, South San Francisco
- Manufacturing Products, South San Francisco
- Manufacturing Services, South San Francisco
- Marble, South San Francisco
- Marble & Terrazzo Flooring - Cleaning & Service, South San Francisco
- Marinas & Marina Services, South San Francisco
- Marine Electronic Equipment, South San Francisco
- Marine Supplies & Equipment, South San Francisco - Boat Supplies
- Market Research & Analysis , South San Francisco - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, South San Francisco
- Martial Arts & Self Defense Schools, South San Francisco
- Masonry Contractors, South San Francisco - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, South San Francisco
- Massage Therapists & Professional, South San Francisco
- Massage Therapy, South San Francisco
- Mastectomy Apparel, Forms, Prostheses & Supplies, South San Francisco
- Material Handling & Heavy Machinery & Equipment, South San Francisco
- Material Handling Equipment, South San Francisco - Conveyor Belt, Pallet Jack, Forklift, etc
- Mats & Matting, South San Francisco
- Mausoleums Developers, South San Francisco
- Meat Market, Wholesale & Products, South San Francisco
- Mechanical Engineer, South San Francisco - Mechanical Engineering Service
- Medical & Dental Management, South San Francisco
- Medical Business Management Services, South San Francisco
- Medical Crutches, South San Francisco
- Medical Equipment Manufacturers, South San Francisco
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, South San Francisco
- Medical Management & Business Administration Service, South San Francisco
- Medical Research, South San Francisco
- Medical Research & Development, South San Francisco - Medical Information & Research
- Medical Research Facilities, South San Francisco - Research & Development Centers
- Medical Supplies & Equipment, South San Francisco
- Meeting & Event Planning Services, South San Francisco - Conference Consultants
- Membership Sports & Recreation Clubs, South San Francisco
- Men's Clothing Stores, South San Francisco - Clothes & Accessories
- Mental Health Clinics, South San Francisco - Treatment Centers
- Mental Health Specialists, South San Francisco - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, South San Francisco
- Metal Finishing Equipment & Supplies, South San Francisco
- Metal Repair Service & Blacksmith, South San Francisco - Iron Works
- Metal Specialties, South San Francisco
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- Metal Windows, South San Francisco
- Metal Working Machinery, South San Francisco
- Metals Base, South San Francisco
- Methodist Church, South San Francisco
- Mexican Food, South San Francisco
- Mexican Restaurants, South San Francisco
- Mildew Removal & Control, South San Francisco - Mold Removal
- Millwork Contractors, South San Francisco
- Mini & Self Storage, South San Francisco
- Miniatures Collectors, South San Francisco
- Mining, South San Francisco
- Mirrors, South San Francisco - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, South San Francisco
- Miscellaneous Household Item Repair, South San Francisco
- Miscellaneous Agriculture, South San Francisco
- Miscellaneous Business Services, South San Francisco
- Miscellaneous Government, South San Francisco
- Miscellaneous Industry, South San Francisco
- Miscellaneous Manufacturing, South San Francisco
- Miscellaneous Personal Services, South San Francisco
- Miscellaneous Photographers, South San Francisco
- Miscellaneous Professional, South San Francisco
- Mobile Home Parks & Communities , South San Francisco
- Money Transfer Service, South San Francisco
- Monuments, Tombstones, Markers & Memorials, South San Francisco
- Mortgage Bankers & Correspondents, South San Francisco
- Mortgage Companies, South San Francisco
- Mortgages & Loans, South San Francisco
- Mosques, South San Francisco
- Motion Picture & Television Production Services, South San Francisco
- Motion Picture Equipment & Supplies, South San Francisco
- Motion Picture Personnel Services, South San Francisco
- Motion Picture Pre & Post Production Services, South San Francisco
- Motion Picture Support Services, South San Francisco
- Motor Vehicle, South San Francisco
- Motor Vehicle Rental & Leasing, South San Francisco
- Motorcycle Parts, Accessories & Dealers, South San Francisco
- Motorcycle Wreckers, South San Francisco
- Movie Theaters, South San Francisco
- Moving & Storage Supplies & Equipment, South San Francisco
- Moving Companies, South San Francisco
- Moving Services - Labor & Material, South San Francisco
- Moving Supplies & Equipment Rental, South San Francisco
- Moving Truck Rental , South San Francisco
- Muffler Shop & Exhaust Systems, South San Francisco
- Multimedia Publishers, South San Francisco - Multimedia Services & Systems
- Murals & Faux Finish Walls, South San Francisco
- Museums, South San Francisco
- Music, South San Francisco
- Music Entertainment, South San Francisco
- Music Lessons, South San Francisco
- Music Lessons - Instrumental, South San Francisco
- Music Production Services, South San Francisco
- Musical Instrument Manufacturers, South San Francisco
- Musical Instrument Rental, South San Francisco - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, South San Francisco
- Musical Instruments - Guitars, South San Francisco
- Musical Instruments Repair, Sales & Service, South San Francisco
- Musical Recording Services, South San Francisco
- Musicians, Bands & Disc Jockeys, South San Francisco
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