- Machine Shop, Fontana
- Machine Shop & Tool Repair Service, Fontana
- Machinery And Equipment Manufacturers, Fontana
- Machinery Movers & Erectors, Fontana
- Machinery Repair & Rebuild, Fontana
- Machinery, Supplies & Equipment - Business Production Related, Fontana
- Machinery, Supplies & Equipment - Business Supplies Related, Fontana
- Machinery, Supplies & Equipment - Construction & Contractor Related, Fontana
- Mail Boxes Manufacturers, Fontana
- Mailbox Rental Services, Fontana
- Mailboxes Retail, Fontana
- Mailing, Delivery & Courier Service, Fontana
- Major Appliances, Fontana - Household & Kitchen
- Malls & Shopping Centers, Fontana
- Management Consultants & Services, Fontana
- Manicurists & Pedicurists, Fontana
- Manufacturing, Fontana
- Manufacturing Products, Fontana
- Marine & Boat Products, Fontana
- Marine Products And Services, Fontana
- Marine Services, Fontana
- Marine Supplies & Equipment, Fontana - Boat Supplies
- Marriage & Family Counselors, Fontana
- Marriage & Family Counselors Information & Referrals, Fontana
- Martial Arts & Self Defense Schools, Fontana
- Masonry Materials & Supplies, Fontana
- Massage Therapists & Professional, Fontana
- Massage Therapy, Fontana
- Material Handling & Heavy Machinery & Equipment, Fontana
- Material Handling Equipment, Fontana - Conveyor Belt, Pallet Jack, Forklift, etc
- Mattress & Bedspring Manufacturers, Fontana
- Meat Market, Wholesale & Products, Fontana
- Mechanical Engineer, Fontana - Mechanical Engineering Service
- Medical & Dental Management, Fontana
- Medical & Infectious Waste Disposal, Fontana
- Medical Diagnostic Clinics, Fontana - Clinical Labs & Centers
- Medical Diagnostic Imaging, Fontana
- Medical Equipment Manufacturers, Fontana
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Fontana
- Medical Groups & Clinics, Fontana - Medical & Health Centers
- Medical Management & Business Administration Service, Fontana
- Medical Supplies & Equipment, Fontana
- Membership Sports & Recreation Clubs, Fontana
- Men's Clothing Stores, Fontana - Clothes & Accessories
- Mental Health Specialists, Fontana - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Fontana
- Metal Boxes & Containers, Fontana
- Metal Buildings, Fontana - Kits, Homes, Steel Buildings, etc
- Metal Coating & Allied Services, Fontana
- Metal Cutting Services, Fontana
- Metal Distributors, Fontana
- Metal Roll Forming Manufacturers, Fontana
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- Metals Base, Fontana
- Metals Expanded, Fontana
- Methodist Church, Fontana
- Mexican Food, Fontana
- Mexican Restaurants, Fontana
- Mini & Self Storage, Fontana
- Mining, Fontana
- Mining Equipment & Supplies Service & Repair, Fontana
- Miscellaneous Business Product Repair, Fontana
- Miscellaneous Household Item Repair, Fontana
- Miscellaneous Agriculture, Fontana
- Miscellaneous Business Services, Fontana
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Fontana
- Miscellaneous Government, Fontana
- Miscellaneous Industry, Fontana
- Miscellaneous Manufacturing, Fontana
- Miscellaneous Metal Work Manufacturers, Fontana
- Miscellaneous Personal Services, Fontana
- Miscellaneous Professional, Fontana
- Mission Churches, Fontana
- Mobile Automobile Services, Fontana
- Mobile Home Contractors, Fontana
- Mobile Home Improvements & Repairs, Fontana
- Mobile Home Parks & Communities , Fontana
- Modular & Mobile Homes For Sale, Fontana - Manufactured Homes Sale & Service
- Moldings Materials, Fontana
- Money Transfer Service, Fontana
- Mongolian Restaurants, Fontana
- Monuments, Tombstones, Markers & Memorials, Fontana
- Mortgage Bankers & Correspondents, Fontana
- Mortgage Companies, Fontana
- Mortgages & Loans, Fontana
- Motel & Hotel Equipment & Supplies Manufacturers, Fontana
- Motion Picture Equipment & Supplies, Fontana
- Motion Picture Film, Fontana
- Motor Vehicle, Fontana
- Motor Vehicle Rental & Leasing, Fontana
- Motorcycle Driving School, Fontana
- Motorcycle Parts, Accessories & Dealers, Fontana
- Movie Theaters, Fontana
- Moving & Storage Supplies & Equipment, Fontana
- Moving Companies, Fontana
- Moving Supplies & Equipment Rental, Fontana
- Moving Truck Rental , Fontana
- Muffler Shop & Exhaust Systems, Fontana
- Music, Fontana
- Music Lessons, Fontana
- Music Lessons - Instrumental, Fontana
- Music Libraries, Fontana
- Musical Instrument Rental, Fontana - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Fontana
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