- Machine Shop & Tool Repair Service, Glendora
- Machine Tool Repair & Rebuild, Glendora
- Machinery And Equipment Manufacturers, Glendora
- Machinery, Supplies & Equipment - Business Production Related, Glendora
- Machinery, Supplies & Equipment - Business Supplies Related, Glendora
- Machinery, Supplies & Equipment - Construction & Contractor Related, Glendora
- Magazine & Newspaper Stands, Glendora - Dealers & Distributors
- Mailbox Rental Services, Glendora
- Mailing, Delivery & Courier Service, Glendora
- Maintenance, Cleaning & Sanitation, Glendora
- Major Appliances, Glendora - Household & Kitchen
- Make Up & Cosmetics Application, Glendora
- Malls & Shopping Centers, Glendora
- Management Consultants & Services, Glendora
- Manicurists & Pedicurists, Glendora
- Manifold Business Forms Manufacturers, Glendora
- Manufacturers Agents & Representatives, Glendora
- Manufacturers Representative, Glendora - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Glendora
- Manufacturing Equipment & Supplies, Glendora
- Manufacturing Products, Glendora
- Marine Supplies & Equipment, Glendora - Boat Supplies
- Marriage & Family Counselors, Glendora
- Martial Arts & Self Defense Schools, Glendora
- Mary Kay Cosmetics, Glendora
- Masonry Contractors, Glendora - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Glendora
- Massage Therapists & Professional, Glendora
- Massage Therapy, Glendora
- Meat Market, Wholesale & Products, Glendora
- Meat Packers, Glendora
- Medical & Dental Management, Glendora
- Medical & Health Service Organizations, Glendora
- Medical Billing Services, Glendora
- Medical Business Management Services, Glendora
- Medical Diagnostic Clinics, Glendora - Clinical Labs & Centers
- Medical Diagnostic Imaging, Glendora
- Medical Management & Business Administration Service, Glendora
- Medical Supplies & Equipment, Glendora
- Men's Clothing Stores, Glendora - Clothes & Accessories
- Mental Health Specialists, Glendora - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Finishing Equipment & Supplies, Glendora
- Metal Repair Service & Blacksmith, Glendora - Iron Works
- Metal Spinning Manufacturers, Glendora
- Metal Stampings Manufacturers, Glendora
- Metal Working Machinery, Glendora
- Methodist Church, Glendora
- Mexican Restaurants, Glendora
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- Mildew Removal & Control, Glendora - Mold Removal
- Mini & Self Storage, Glendora
- Ministries Church, Glendora
- Mirrors, Glendora - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Glendora
- Miscellaneous Business Services, Glendora
- Miscellaneous Government, Glendora
- Miscellaneous Industry, Glendora
- Miscellaneous Manufacturing, Glendora
- Miscellaneous Metal Work Manufacturers, Glendora
- Miscellaneous Personal Services, Glendora
- Miscellaneous Photographers, Glendora
- Miscellaneous Professional, Glendora
- Mobile Home Parks & Communities , Glendora
- Mobile Home Parks Development, Glendora
- Mobile Homes for Rent & Lease, Glendora
- Money Transfer Service, Glendora
- Mortgage Bankers & Correspondents, Glendora
- Mortgage Companies, Glendora
- Mortgage Loan Processors, Glendora
- Mortgages & Loans, Glendora
- Motion Picture & Television Production Services, Glendora
- Motor Vehicle, Glendora
- Motor Vehicle Rental & Leasing, Glendora
- Motorcycle & Motor Scooters Dealers, Repair & Service, Glendora
- Motorcycle Parts, Accessories & Dealers, Glendora
- Motorcycle Repair & Service, Glendora
- Movie Theaters, Glendora
- Moving & Storage Supplies & Equipment, Glendora
- Moving Companies, Glendora
- Moving Supplies & Equipment Rental, Glendora
- Moving Truck Rental , Glendora
- Muffler Shop & Exhaust Systems, Glendora
- Multimedia Publishers, Glendora - Multimedia Services & Systems
- Museums, Glendora
- Music, Glendora
- Music Entertainment, Glendora
- Music Lessons, Glendora
- Music Lessons - Instrumental, Glendora
- Music Lessons - Vocal, Glendora
- Music Libraries, Glendora
- Music Schools, Glendora
- Musical Instrument Rental, Glendora - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Glendora
- Musical Instruments - Guitars, Glendora
- Musical Instruments Repair, Sales & Service, Glendora
- Musical Recording Services, Glendora
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