- Machine Shop & Tool Repair Service, Walnut
- Machine Shop Rotary Surface Grinding, Walnut - Tool Grinding & Sharpening
- Machine Tools , Walnut
- Machinery, Supplies & Equipment - Business Production Related, Walnut
- Machinery, Supplies & Equipment - Business Supplies Related, Walnut
- Machinery, Supplies & Equipment - Construction & Contractor Related, Walnut
- Mailbox Rental Services, Walnut
- Mailboxes Retail, Walnut
- Mailing, Delivery & Courier Service, Walnut
- Maintenance, Cleaning & Sanitation, Walnut
- Major Appliances, Walnut - Household & Kitchen
- Management Consultants & Services, Walnut
- Management Training & Development, Walnut
- Manicurists & Pedicurists, Walnut
- Manufacturers Agents & Representatives, Walnut
- Manufacturers Representative, Walnut - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Walnut
- Manufacturing & Industrial Consultants, Walnut
- Manufacturing Products, Walnut
- Marble, Walnut
- Marine Animals & Fish, Walnut
- Marine Supplies & Equipment, Walnut - Boat Supplies
- Market Research & Analysis , Walnut - Market Analysis, Business & Economic Research
- Martial Arts & Self Defense Schools, Walnut
- Masonry Materials & Supplies, Walnut
- Material Handling Equipment, Walnut - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Walnut
- Mechanical Contractors, Walnut - Install, Service & Repair
- Mechanical Engineer, Walnut - Mechanical Engineering Service
- Medical & Health Service Organizations, Walnut
- Medical Diagnostic Imaging, Walnut
- Medical Supplies & Equipment, Walnut
- Membership Sports & Recreation Clubs, Walnut
- Men's Clothing Stores, Walnut - Clothes & Accessories
- Mental Health Specialists, Walnut - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Marketing Consultants, Walnut
- Merlin Telephone Equipment & Service, Walnut
- Metal Buyers, Walnut
- Metal Repair Service & Blacksmith, Walnut - Iron Works
- Metal Services, Walnut
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- Metal Working Machinery, Walnut
- Methodist Church, Walnut
- Mexican & Latin American Goods & Products Stores, Walnut
- Mexican Food & Goods Products, Walnut
- Mexican Restaurants, Walnut
- Midget Automobile Racing, Walnut
- Mildew Removal & Control, Walnut - Mold Removal
- Mill Ends, Walnut
- Millwrights, Walnut
- Mini & Self Storage, Walnut
- Ministries Church, Walnut
- Miscellaneous Business Manufacturing, Walnut
- Miscellaneous Household Item Repair, Walnut
- Miscellaneous Business Services, Walnut
- Miscellaneous Government, Walnut
- Miscellaneous Industry, Walnut
- Miscellaneous Manufacturing, Walnut
- Miscellaneous Personal Services, Walnut
- Miscellaneous Professional, Walnut
- Mobile Home Insurance, Walnut
- Mobile Home Parks & Communities , Walnut
- Mobile Homes for Rent & Lease, Walnut
- Modular & Mobile Homes For Sale, Walnut - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Walnut
- Mortgage Companies, Walnut
- Mortgages & Loans, Walnut
- Motion Picture & Television Production Services, Walnut
- Motion Picture Pre & Post Production Services, Walnut
- Motor Vehicle, Walnut
- Motor Vehicle Rental & Leasing, Walnut
- Motorcycle Parts, Accessories & Dealers, Walnut
- Moving & Storage Supplies & Equipment, Walnut
- Moving Companies, Walnut
- Moving Services - Labor & Material, Walnut
- Moving Truck Rental , Walnut
- Multimedia Publishers, Walnut - Multimedia Services & Systems
- Music, Walnut
- Music Lessons, Walnut
- Music Lessons - Instrumental, Walnut
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