- Machine Shop, New Castle
- Machine Shop & Tool Repair Service, New Castle
- Machinery And Equipment Manufacturers, 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 & Newspaper Stands, New Castle - Dealers & Distributors
- Mailing, Delivery & Courier Service, New Castle
- Maintenance, Cleaning & Sanitation, New Castle
- Major Appliance Parts, New Castle
- Major Appliances, New Castle - Household & Kitchen
- Management Consultants & Services, New Castle
- Mandarin Restaurants, 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 Equipment & Supplies, New Castle
- Manufacturing Products, New Castle
- Marine Supplies & Equipment, New Castle - Boat Supplies
- 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
- Massage Therapists & Professional, New Castle
- Massage Therapy, New Castle
- Material Handling & Heavy Machinery & Equipment, New Castle
- Material Handling Equipment, New Castle - Conveyor Belt, Pallet Jack, Forklift, etc
- Mausoleums Developers, New Castle
- Mechanical Engineer, New Castle - Mechanical Engineering Service
- Medical & Dental Management, New Castle
- Medical Business Management Services, New Castle
- Medical Diagnostic Clinics, New Castle - Clinical Labs & Centers
- Medical Management & Business Administration Service, New Castle
- Medical Supplies & Equipment, New Castle
- Membership Sports & Recreation Clubs, New Castle
- Men's Clothing Stores, New Castle - Clothes & Accessories
- Mennonite Church, New Castle
- Mental & Developmental Information & Referral Services, New Castle
- Mental Health Specialists, New Castle - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, New Castle - Wood Buildings
- Metal Buildings, New Castle - Kits, Homes, Steel Buildings, etc
- Metal Coating & Allied Services, New Castle
- Metal Finishers, New Castle
- Metal Goods Alloys, New Castle
- Metal Perforating & Punching, New Castle
- Metal Plating & Polishing, New Castle
- Metal Powder Products, New Castle
- Metal Specialties, New Castle
- Methodist Church, New Castle
- Mexican Restaurants, New Castle
- Middle Eastern Restaurants, New Castle
- Mildew Removal & Control, New Castle - Mold Removal
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- Millwork Contractors, New Castle
- Mini & Self Storage, New Castle
- Mining, New Castle
- Mining Contractors, New Castle - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, New Castle - Mining Companies
- Ministries Church, New Castle
- Mirrors, New Castle - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, New Castle
- Miscellaneous Household Item Repair, New Castle
- Miscellaneous Prosthesis & Appliances, New Castle
- Miscellaneous Agriculture, New Castle
- Miscellaneous Business Services, New Castle
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, 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
- Mission Churches, New Castle
- Mobile Home Contractors, New Castle
- Mobile Home Improvements & Repairs, New Castle
- Mobile Home Parks & Communities , New Castle
- Mobile Lube Systems, New Castle
- Modular & Mobile Homes For Sale, New Castle - Manufactured Homes Sale & Service
- Moldings Materials, New Castle
- Molds, New Castle
- Monuments, Tombstones, Markers & Memorials, New Castle
- Mortgage Bankers & Correspondents, New Castle
- Mortgage Companies, New Castle
- Mosques, 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
- Movie Theaters, New Castle
- Moving & Storage Consultants, New Castle
- Moving Companies, New Castle
- Moving Truck Rental , New Castle
- Muffler Shop & Exhaust Systems, New Castle
- Mulch, Peat & Moss Products, New Castle
- Multimedia Publishers, New Castle - Multimedia Services & Systems
- Museums, New Castle
- Music, New Castle
- Music Entertainment, New Castle
- Music Lessons, New Castle
- Music Lessons - Instrumental, New Castle
- Music Schools, New Castle
- Musical Instrument Rental, New Castle - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, New Castle
- Musical Instruments Repair, Sales & Service, New Castle
- Musicians, Bands & Disc Jockeys, New Castle
- Muslim Church, New Castle
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