- Machine Shop, Sylmar
- Machine Shop & Tool Repair Service, Sylmar
- Machine Shop Equipment & Supplies, Sylmar
- Machine Tools , Sylmar
- Machinery And Equipment Manufacturers, Sylmar
- Machinery Movers & Erectors, Sylmar
- Machinery, Supplies & Equipment - Business Production Related, Sylmar
- Machinery, Supplies & Equipment - Business Supplies Related, Sylmar
- Machinery, Supplies & Equipment - Construction & Contractor Related, Sylmar
- Mailbox Rental Services, Sylmar
- Mailing List Service, Brokers & Compilers, Sylmar
- Mailing, Delivery & Courier Service, Sylmar
- Maintenance, Cleaning & Sanitation, Sylmar
- Major Appliances, Sylmar - Household & Kitchen
- Malls & Shopping Centers, Sylmar
- Management Consultants & Services, Sylmar
- Manicurists & Pedicurists, Sylmar
- Manufacturers Agents & Representatives, Sylmar
- Manufacturers Representative, Sylmar - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Sylmar
- Manufacturing & Industrial Consultants, Sylmar
- Manufacturing Products, Sylmar
- Marble, Sylmar
- Marble Contractors, Sylmar - Installation, Cleaning & Removal Services
- Markets & Grocers Equipment, Sylmar
- Marriage & Family Counselors, Sylmar
- Martial Arts & Self Defense Schools, Sylmar
- Masonry Contractors, Sylmar - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Sylmar
- Masonry Panels Prefabricated, Sylmar
- Massage Therapy, Sylmar
- Mats & Matting, Sylmar
- Meat Market, Wholesale & Products, Sylmar
- Mechanical Contractors, Sylmar - Install, Service & Repair
- Medical & Dental Management, Sylmar
- Medical Diagnostic Clinics, Sylmar - Clinical Labs & Centers
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Sylmar
- Medical Management & Business Administration Service, Sylmar
- Medical Supplies & Equipment, Sylmar
- Membership Sports & Recreation Clubs, Sylmar
- Men's Clothing Stores, Sylmar - Clothes & Accessories
- Mental Health Specialists, Sylmar - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Sylmar
- Merle Norman Cosmetics, Sylmar
- Metal Coating & Allied Services, Sylmar
- Metal Cutting Services, Sylmar
- Metal Finishers, Sylmar
- Metal Plating & Polishing, Sylmar
- Metal Polishing & Buffing, Sylmar
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- Metal Repair Service & Blacksmith, Sylmar - Iron Works
- Metal Stamping Equipment, Sylmar
- Metal Stampings Manufacturers, Sylmar
- Metal Working Machinery, Sylmar
- Methodist Church, Sylmar
- Mexican Restaurants, Sylmar
- Mildew Removal & Control, Sylmar - Mold Removal
- Millwork Contractors, Sylmar
- Mini & Self Storage, Sylmar
- Miscellaneous Business Product Repair, Sylmar
- Miscellaneous Household Item Repair, Sylmar
- Miscellaneous Agriculture, Sylmar
- Miscellaneous Business Services, Sylmar
- Miscellaneous Government, Sylmar
- Miscellaneous Industry, Sylmar
- Miscellaneous Manufacturing, Sylmar
- Miscellaneous Metal Work Manufacturers, Sylmar
- Miscellaneous Personal Services, Sylmar
- Miscellaneous Professional, Sylmar
- Mission Churches, Sylmar
- Mobile Home Parks & Communities , Sylmar
- Mobile Home Parks Development, Sylmar
- Modular & Mobile Homes For Sale, Sylmar - Manufactured Homes Sale & Service
- Molds, Sylmar
- Money Transfer Service, Sylmar
- Mortgage Bankers & Correspondents, Sylmar
- Mortgages & Loans, Sylmar
- Motion Picture & Television Production Services, Sylmar
- Motion Picture Equipment & Supplies, Sylmar
- Motion Picture Film, Sylmar
- Motion Picture Personnel Services, Sylmar
- Motion Picture Properties, Sylmar
- Motion Picture Special Effects, Sylmar
- Motion Picture Support Services, Sylmar
- Motor Homes Manufacturers, Sylmar
- Motor Homes Renting & Leasing, Sylmar
- Motor Vehicle, Sylmar
- Motor Vehicle Rental & Leasing, Sylmar
- Motorcycle Parts, Accessories & Dealers, Sylmar
- Motorcycles & Motor Scooters Manufacturers, Sylmar
- Motorcycles Bicycles & Parts, Sylmar
- Movie Theaters, Sylmar
- Moving Companies, Sylmar
- Moving Truck Rental , Sylmar
- Muffler Shop & Exhaust Systems, Sylmar
- Museums, Sylmar
- Music, Sylmar
- Musical Instruments & Equipment Stores, Sylmar
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