- Machine Shop & Tool Repair Service, New Castle
- Machinery Repair & Rebuild, New Castle
- Machinery, Supplies & Equipment - Business Production Related, New Castle
- Machinery, Supplies & Equipment - Business Supplies Related, New Castle
- Machinery, Supplies & Equipment - Construction & Contractor Related, New Castle
- Magazine Printing & Publishing, New Castle
- Major Appliances, New Castle - Household & Kitchen
- Malls & Shopping Centers, New Castle
- Management Consultants & Services, New Castle
- Manicurists & Pedicurists, New Castle
- Manufacturers Agents & Representatives, New Castle
- Manufacturers Representative, New Castle - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, New Castle
- Manufacturing & Industrial Consultants, New Castle
- Manufacturing Products, New Castle
- Marriage & Family Counselors, New Castle
- Martial Arts & Self Defense Schools, New Castle
- Masonry Contractors, New Castle - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, New Castle
- Mastectomy Apparel, Forms, Prostheses & Supplies, New Castle
- Mausoleums Developers, New Castle
- Maytag Appliances, New Castle
- Medical & Dental Management, New Castle
- Medical Diagnostic Clinics, New Castle - Clinical Labs & Centers
- Medical Diagnostic Imaging, New Castle
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, New Castle
- Medical Management & Business Administration Service, New Castle
- Medical Supplies & Equipment, New Castle
- Membership Sports & Recreation Clubs, New Castle
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- Mental Health Clinics, New Castle - Treatment Centers
- Mental Health Specialists, New Castle - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, New Castle
- Methodist Church, New Castle
- Mexican Restaurants, New Castle
- Mini & Self Storage, New Castle
- Ministries Church, New Castle
- Mirrors, New Castle - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, New Castle
- Miscellaneous Agriculture, New Castle
- Miscellaneous Business Services, New Castle
- Miscellaneous Government, New Castle
- Miscellaneous Industry, New Castle
- Miscellaneous Manufacturing, New Castle
- Miscellaneous Personal Services, New Castle
- Miscellaneous Photographers, New Castle
- Miscellaneous Professional, New Castle
- Mobile Home Parks & Communities , New Castle
- Monuments, Tombstones, Markers & Memorials, New Castle
- Mortgage Bankers & Correspondents, New Castle
- Motor Vehicle, New Castle
- Motor Vehicle Rental & Leasing, New Castle
- Motorcycle Parts, Accessories & Dealers, New Castle
- Movie Theaters, New Castle
- Moving Truck Rental , New Castle
- Muffler Shop & Exhaust Systems, New Castle
- Museums, New Castle
- Music, New Castle
- Music Distribution, New Castle
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