- Machine Shop & Tool Repair Service, Warren
- Machinery, Supplies & Equipment - Business Production Related, Warren
- Major Appliances, Warren - Household & Kitchen
- Management Consultants & Services, Warren
- Manicurists & Pedicurists, Warren
- Manufacturers Agents & Representatives, Warren
- Manufacturers Representative, Warren - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Warren
- Market Research & Analysis , Warren - Market Analysis, Business & Economic Research
- Masonry Contractors, Warren - Stone Mason, Brick Mason - Install & Repair
- Mechanical Seals, Warren
- Medical & Dental Management, Warren
- Medical Groups & Clinics, Warren - Medical & Health Centers
- Medical Management & Business Administration Service, Warren
- Medical Supplies & Equipment, Warren
- Membership Sports & Recreation Clubs, Warren
- Mental Health Specialists, Warren - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Warren
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- Mirrors, Warren - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Government, Warren
- Miscellaneous Manufacturing, Warren
- Miscellaneous Personal Services, Warren
- Miscellaneous Photographers, Warren
- Miscellaneous Professional, Warren
- Mortgage Bankers & Correspondents, Warren
- Motion Picture Pre & Post Production Services, Warren
- Motion Pictures Video Tape Duplication & Transfer Services, Warren
- Motor Vehicle, Warren
- Motor Vehicle Rental & Leasing, Warren
- Motorcycle Parts, Accessories & Dealers, Warren
- Moving Truck Rental , Warren
- Muffler Shop & Exhaust Systems, Warren
- Museums, Warren
- Music, Warren
- Musical Recording Services, Warren
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