- Machine Shop, New Castle
- Machine Shop & Tool Repair Service, New Castle
- Machine Shops Slings, 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
- Magicians & Hypnotist Entertainers, New Castle
- Magicians & Jugglers Equipment & Supplies, New Castle
- Mailing, Delivery & Courier Service, New Castle
- Maintenance, Cleaning & Sanitation, New Castle
- Major Appliances, New Castle - Household & Kitchen
- Malls & Shopping Centers, New Castle
- Management Consultants & Services, New Castle
- Manicurists & Pedicurists, New Castle
- Manufacturing, New Castle
- Manufacturing & Industrial Consultants, New Castle
- Manufacturing Equipment & Supplies, New Castle
- Manufacturing Products, New Castle
- Marine Electronic Equipment, New Castle
- Marine Products And Services, New Castle
- Marine Repair & Service Stations, New Castle
- Marine Supplies & Equipment, New Castle - Boat Supplies
- Marine Supplies & Equipment Repair, New Castle - Boat Supplies & Equipment
- Martial Arts & Self Defense Schools, New Castle
- Masonry Contractors, New Castle - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, New Castle
- Massage Therapists & Professional, New Castle
- Massage Therapy, New Castle
- Material Handling & Heavy Machinery & Equipment, New Castle
- Mats & Matting, New Castle
- Mausoleums Developers, New Castle
- Meat Market, Wholesale & Products, New Castle
- Meat Packers, New Castle
- Mechanical Contractors, New Castle - Install, Service & Repair
- Mechanical Engineer, New Castle - Mechanical Engineering Service
- Medical Billing Services, New Castle
- Medical Diagnostic Clinics, New Castle - Clinical Labs & Centers
- Medical Supplies & Equipment, New Castle
- Membership Sports & Recreation Clubs, New Castle
- Men's & Boys Clothing & Accessories Stores, New Castle
- Mens & Boys Jeans & Western Wear Stores, New Castle
- Mental Health Specialists, New Castle - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, New Castle
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- Metal Galvanizing, New Castle
- Metal Repair Service & Blacksmith, New Castle - Iron Works
- Metal Tanks, New Castle
- Methodist Church, New Castle
- Mexican Restaurants, New Castle
- Mildew Removal & Control, New Castle - Mold Removal
- Mini & Self Storage, New Castle
- Mining, New Castle
- Mining Equipment & Supplies Service & Repair, New Castle
- Ministries Church, New Castle
- Mirrors, New Castle - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Services, New Castle
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, New Castle
- Miscellaneous Government, New Castle
- Miscellaneous Manufacturing, New Castle
- Miscellaneous Personal Services, New Castle
- Miscellaneous Photographers, New Castle
- Miscellaneous Professional, New Castle
- Money Transfer Service, New Castle
- Monuments, Tombstones, Markers & Memorials, New Castle
- Mortgage Bankers & Correspondents, New Castle
- Mortgages & Loans, New Castle
- Mosquito Control, New Castle
- Motion Picture Pre & Post Production Services, New Castle
- Motor Vehicle, New Castle
- Motor Vehicle Rental & Leasing, New Castle
- Motorcycle & Motor Scooters Dealers, Repair & Service, New Castle
- Motorcycle Parts, Accessories & Dealers, New Castle
- Motorcycle Repair & Service, New Castle
- Moving & Storage Consultants, New Castle
- Moving & Storage Supplies & Equipment, New Castle
- Moving Companies, New Castle
- Moving Supplies & Equipment Rental, New Castle
- Moving Truck Rental , New Castle
- Muffler Shop & Exhaust Systems, New Castle
- Multimedia Publishers, New Castle - Multimedia Services & Systems
- Museums, New Castle
- Music, New Castle
- Music Entertainment, New Castle
- Musical Instrument Rental, New Castle - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, New Castle
- Musical Recording Services, New Castle
- Musicians, Bands & Disc Jockeys, New Castle
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