- Machine Shop, National City
- Machine Shop & Tool Repair Service, National City
- Machinery Repair & Rebuild, National City
- Machinery, Supplies & Equipment - Business Production Related, National City
- Machinery, Supplies & Equipment - Business Supplies Related, National City
- Machinery, Supplies & Equipment - Construction & Contractor Related, National City
- Magazine & Newspaper Stands, National City - Dealers & Distributors
- Magicians & Jugglers Equipment & Supplies, National City
- Mailbox Rental Services, National City
- Mailing, Delivery & Courier Service, National City
- Major Appliances, National City - Household & Kitchen
- Malls & Shopping Centers, National City
- Management Consultants & Services, National City
- Mandarin Restaurants, National City
- Manicurists & Pedicurists, National City
- Manufacturing, National City
- Manufacturing & Industrial Consultants, National City
- Manufacturing Equipment & Supplies, National City
- Manufacturing Products, National City
- Marinas & Marina Services, National City
- Marine Contractors & Designers, National City
- Marine Pilot & Operator Service, National City
- Marine Products And Services, National City
- Marine Repair & Service Stations, National City
- Marine Services, National City
- Marine Supplies & Equipment, National City - Boat Supplies
- Marine Supplies & Equipment Repair, National City - Boat Supplies & Equipment
- Marionettes & Puppets, National City
- Marriage & Family Counselors, National City
- Martial Arts & Self Defense Schools, National City
- Masonry Materials & Supplies, National City
- Massage Therapy, National City
- Material Handling Equipment, National City - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, National City
- Mechanical Contractors, National City - Install, Service & Repair
- Mechanical Seals, National City
- Medical & Dental Management, National City
- Medical Business Management Services, National City
- Medical Diagnostic Clinics, National City - Clinical Labs & Centers
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, National City
- Medical Groups & Clinics, National City - Medical & Health Centers
- Medical Management & Business Administration Service, National City
- Medical Supplies & Equipment, National City
- Men's Clothing Stores, National City - Clothes & Accessories
- Men's Shoe Stores, National City
- Mental Health Specialists, National City - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, National City
- Merchandising & Marketing Consultants, National City
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- Metal Plating & Polishing, National City
- Metal Products, National City
- Metal Stampings Manufacturers, National City
- Metal Windows, National City
- Metals Base, National City
- Methodist Church, National City
- Mexican Food, National City
- Mexican Restaurants, National City
- Millwork Contractors, National City
- Mini & Self Storage, National City
- Ministries Church, National City
- Miscellaneous Business Product Repair, National City
- Miscellaneous Household Item Repair, National City
- Miscellaneous Business Services, National City
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, National City
- Miscellaneous Government, National City
- Miscellaneous Manufacturing, National City
- Miscellaneous Metal Work Manufacturers, National City
- Miscellaneous Personal Services, National City
- Miscellaneous Photographers, National City
- Miscellaneous Professional, National City
- Mission Churches, National City
- Mobile Home Parks & Communities , National City
- Moldings Materials, National City
- Money Transfer Service, National City
- Monuments, Tombstones, Markers & Memorials, National City
- Mortgage Bankers & Correspondents, National City
- Mortgage Companies, National City
- Mortgages & Loans, National City
- Motion Picture & Television Production Services, National City
- Motion Picture Dists & Producers, National City
- Motivational & Self Improvement Schools, National City
- Motor Homes, National City
- Motor Vehicle, National City
- Motor Vehicle Rental & Leasing, National City
- Motorcycle & Motor Scooters Dealers, Repair & Service, National City
- Motorcycle Parts, Accessories & Dealers, National City
- Motorcycle Repair & Service, National City
- Movie Theaters, National City
- Moving Companies, National City
- Moving Truck Rental , National City
- Muffler Shop & Exhaust Systems, National City
- Music, National City
- Music Lessons, National City
- Music Lessons - Instrumental, National City
- Musical Instrument Rental, National City - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, National City
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