- Machine Shop, South Gate
- Machine Shop & Tool Repair Service, South Gate
- Machine Shop Rotary Surface Grinding, South Gate - Tool Grinding & Sharpening
- Machine Tools Manufacturers Metal Forming Types, South Gate
- Machinery And Equipment Manufacturers, South Gate
- Machinery, Supplies & Equipment - Business Production Related, South Gate
- Machinery, Supplies & Equipment - Business Supplies Related, South Gate
- Machinery, Supplies & Equipment - Construction & Contractor Related, South Gate
- Mailing, Delivery & Courier Service, South Gate
- Major Appliances, South Gate - Household & Kitchen
- Management Consultants & Services, South Gate
- Manicurists & Pedicurists, South Gate
- Manufacturers Agents & Representatives, South Gate
- Manufacturers Representative, South Gate - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, South Gate
- Manufacturing & Industrial Consultants, South Gate
- Manufacturing Equipment & Supplies, South Gate
- Manufacturing Products, South Gate
- Masonry Materials & Supplies, South Gate
- Mattress & Bedspring Manufacturers, South Gate
- Maytag Appliances, South Gate
- Meat Market, Wholesale & Products, South Gate
- Medical & Dental Management, South Gate
- Medical & Health Service Organizations, South Gate
- Medical Equipment Manufacturers, South Gate
- Medical Products & Equipment, South Gate
- Men's Clothing Stores, South Gate - Clothes & Accessories
- Men's Shoe Stores, South Gate
- Mental Health Clinics, South Gate - Treatment Centers
- Merle Norman Cosmetics, South Gate
- Metal Forming Equipment - Manufacturers, South Gate
- Metal Heat Treating, South Gate
- Metal Plating & Polishing, South Gate
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- Metal Polishing & Buffing, South Gate
- Metal Repair Service & Blacksmith, South Gate - Iron Works
- Metal Roll Forming Manufacturers, South Gate
- Metal Spinning Manufacturers, South Gate
- Metal Stampings Manufacturers, South Gate
- Metal Tanks, South Gate
- Mexican Food, South Gate
- Mexican Food Products Manufacturers, South Gate
- Mexican Restaurants, South Gate
- Mini & Self Storage, South Gate
- Miscellaneous Household Item Repair, South Gate
- Miscellaneous Business Services, South Gate
- Miscellaneous Government, South Gate
- Miscellaneous Industry, South Gate
- Miscellaneous Manufacturing, South Gate
- Miscellaneous Metal Work Manufacturers, South Gate
- Miscellaneous Personal Services, South Gate
- Miscellaneous Photographers, South Gate
- Miscellaneous Professional, South Gate
- Mobile Home Parks & Communities , South Gate
- Money Transfer Service, South Gate
- Mortgage Bankers & Correspondents, South Gate
- Mortgage Companies, South Gate
- Mortgages & Loans, South Gate
- Motor Vehicle, South Gate
- Motor Vehicle Rental & Leasing, South Gate
- Motorcycle Parts, Accessories & Dealers, South Gate
- Movie Theaters, South Gate
- Moving & Storage Supplies & Equipment, South Gate
- Moving Companies, South Gate
- Moving Truck Rental , South Gate
- Muffler Shop & Exhaust Systems, South Gate
- Music, South Gate
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