- Machine Shop & Tool Repair Service, Downey
- Machine Shop Rotary Surface Grinding, Downey - Tool Grinding & Sharpening
- Machine Tool Repair & Rebuild, Downey
- Machine Tools , Downey
- Machinery, Supplies & Equipment - Business Production Related, Downey
- Machinery, Supplies & Equipment - Business Supplies Related, Downey
- Machinery, Supplies & Equipment - Construction & Contractor Related, Downey
- Mailbox Rental Services, Downey
- Mailing, Delivery & Courier Service, Downey
- Maintenance, Cleaning & Sanitation, Downey
- Major Appliance Repair & Service, Downey
- Major Appliances, Downey - Household & Kitchen
- Make Up & Cosmetics Application, Downey
- Malls & Shopping Centers, Downey
- Management Consultants & Services, Downey
- Manicurists & Pedicurists, Downey
- Manufacturers Agents & Representatives, Downey
- Manufacturing, Downey
- Manufacturing & Industrial Consultants, Downey
- Manufacturing Equipment & Supplies, Downey
- Manufacturing Products, Downey
- Market Research & Analysis , Downey - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Downey
- Marriage & Family Counselors Information & Referrals, Downey
- Martial Arts & Self Defense Schools, Downey
- Masonry Contractors, Downey - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Downey
- Massage Equipment & Supplies, Downey
- Massage Therapists & Professional, Downey
- Massage Therapy, Downey
- Maternity Clothes & Clothing Stores, Downey - Maternity Dress, Gown, Swimwear, Underwear & More
- Maytag Appliances, Downey
- Meat Brokers, Downey
- Meat Market, Wholesale & Products, Downey
- Medical & Dental Management, Downey
- Medical Billing Services, Downey
- Medical Business Management Services, Downey
- Medical Diagnostic Clinics, Downey - Clinical Labs & Centers
- Medical Diagnostic Imaging, Downey
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Downey
- Medical Groups & Clinics, Downey - Medical & Health Centers
- Medical Management & Business Administration Service, Downey
- Medical Research, Downey
- Medical Research & Development, Downey - Medical Information & Research
- Medical Supplements, Downey
- Medical Supplies & Equipment, Downey
- Mediterranean Restaurants, Downey
- Membership Sports & Recreation Clubs, Downey
- Men's Clothing Stores, Downey - Clothes & Accessories
- Mennonite Church, Downey
- Mental Health Clinics, Downey - Treatment Centers
- Mental Health Specialists, Downey - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Downey
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- Metal Coating & Allied Services, Downey
- Metal Cutting Services, Downey
- Metal Detecting Equipment, Downey
- Metal Plating & Polishing, Downey
- Metal Polishing & Buffing, Downey
- Metal Repair Service & Blacksmith, Downey - Iron Works
- Metal Tanks, Downey
- Metal Working Machinery, Downey
- Metaphysical Churches, Downey
- Methodist Church, Downey
- Mexican Food, Downey
- Mexican Food & Goods Products, Downey
- Mexican Restaurants, Downey
- Millwork Contractors, Downey
- Mini & Self Storage, Downey
- Mirrors, Downey - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Downey
- Miscellaneous Business Services, Downey
- Miscellaneous Government, Downey
- Miscellaneous Industry, Downey
- Miscellaneous Manufacturing, Downey
- Miscellaneous Personal Services, Downey
- Miscellaneous Photographers, Downey
- Miscellaneous Professional, Downey
- Mobile Home Parks & Communities , Downey
- Modular & Mobile Homes For Sale, Downey - Manufactured Homes Sale & Service
- Molds, Downey
- Moravian Churches, Downey
- Mortgage Bankers & Correspondents, Downey
- Mortgage Brokers, Downey
- Mortgage Companies, Downey
- Mortgage Feasibility Consultants, Downey
- Mortgage Loan Processors, Downey
- Mortgages & Loans, Downey
- Mortgages Commercial & Industrial, Downey
- Motion Picture & Television Production Services, Downey
- Motion Picture Equipment & Supplies, Downey
- Motion Picture Equipment & Supplies Rent, Downey
- Motor Vehicle, Downey
- Motor Vehicle Rental & Leasing, Downey
- Motorcycle Parts, Accessories & Dealers, Downey
- Movie Theaters, Downey
- Moving & Storage Supplies & Equipment, Downey
- Moving Companies, Downey
- Moving Truck Rental , Downey
- Muffler Shop & Exhaust Systems, Downey
- Museums, Downey
- Music, Downey
- Music Production Services, Downey
- Music Writers Supplies, Downey
- Musical Instruments & Equipment Stores, Downey
- Musical Recording Services, Downey
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