- Machine Shop, Youngstown
- Machine Shop & Tool Repair Service, Youngstown
- Machine Shop Rotary Surface Grinding, Youngstown - Tool Grinding & Sharpening
- Machine Tool Repair & Rebuild, Youngstown
- Machinery And Equipment Manufacturers, Youngstown
- Machinery Custom Design Manufacturers, Youngstown
- Machinery Movers & Erectors, Youngstown
- Machinery Repair & Rebuild, Youngstown
- Machinery, Supplies & Equipment - Business Production Related, Youngstown
- Machinery, Supplies & Equipment - Business Supplies Related, Youngstown
- Machinery, Supplies & Equipment - Construction & Contractor Related, Youngstown
- Magazine & Newspaper Stands, Youngstown - Dealers & Distributors
- Magicians & Hypnotist Entertainers, Youngstown
- Magnetic & Optical Recording Media Manufacturers, Youngstown
- Mailing, Delivery & Courier Service, Youngstown
- Maintenance, Cleaning & Sanitation, Youngstown
- Major Appliances, Youngstown - Household & Kitchen
- Malls & Shopping Centers, Youngstown
- Malpractice Attorneys & Lawyers, Youngstown
- Malpractice Attorneys & Lawyers, Youngstown
- Malpractice Lawyers & Attorneys, Youngstown
- Mammography Clinics, Youngstown - Breast Cancer Screening
- Management Consultants & Services, Youngstown
- Manicurists & Pedicurists, Youngstown
- Manifold Business Forms Manufacturers, Youngstown
- Manufacturers Agents & Representatives, Youngstown
- Manufacturers Representative, Youngstown - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Youngstown
- Manufacturing & Industrial Consultants, Youngstown
- Manufacturing Products, Youngstown
- Manufacturing Services, Youngstown
- Market Research & Analysis , Youngstown - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, Youngstown
- Markets & Grocers Equipment, Youngstown
- Marriage & Family Counselors, Youngstown
- Martial Arts & Self Defense Schools, Youngstown
- Mary Kay Cosmetics, Youngstown
- Masonry Contractors, Youngstown - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Youngstown
- Massage Therapists & Professional, Youngstown
- Massage Therapy, Youngstown
- Mastectomy Apparel, Forms, Prostheses & Supplies, Youngstown
- Material Handling & Heavy Machinery & Equipment, Youngstown
- Material Handling Equipment, Youngstown - Conveyor Belt, Pallet Jack, Forklift, etc
- Maternity Clothes & Clothing Stores, Youngstown - Maternity Dress, Gown, Swimwear, Underwear & More
- Mats & Matting, Youngstown
- Mausoleums Developers, Youngstown
- Meat Market, Wholesale & Products, Youngstown
- Mechanical Contractors, Youngstown - Install, Service & Repair
- Medical & Dental Management, Youngstown
- Medical & Health Service Organizations, Youngstown
- Medical Attorneys & Lawyers, Youngstown
- Medical Attorneys & Lawyers, Youngstown
- Medical Billing Services, Youngstown
- Medical Business Management Services, Youngstown
- Medical Claims Processing & Assistance, Youngstown
- Medical Equipment & Supplies Rental & Leasing, Youngstown
- Medical Equipment Manufacturers, Youngstown
- Medical Groups & Clinics, Youngstown - Medical & Health Centers
- Medical Lawyers & Attorneys, Youngstown
- Medical Management & Business Administration Service, Youngstown
- Medical Records Service , Youngstown
- Medical Research, Youngstown
- Medical Research & Development, Youngstown - Medical Information & Research
- Medical Supplies & Equipment, Youngstown
- Meeting & Event Planning Services, Youngstown - Conference Consultants
- Membership Sports & Recreation Clubs, Youngstown
- Men's & Boys Clothing & Accessories Stores, Youngstown
- Men's Clothing Stores, Youngstown - Clothes & Accessories
- Men's Shoe Stores, Youngstown
- Mennonite Church, Youngstown
- Mental Health Clinics, Youngstown - Treatment Centers
- Mental Health Specialists, Youngstown - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Youngstown
- Merchandise Sales Events, Youngstown
- Merchandising & Marketing Consultants, Youngstown
- Messenger Service, Youngstown - Message Receiving & Forwarding Service
- Messianic Church, Youngstown
- Messianic Synagogues, Youngstown
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- Metal Buildings, Youngstown - Kits, Homes, Steel Buildings, etc
- Metal Coating & Allied Services, Youngstown
- Metal Cutting Services, Youngstown
- Metal Finishers, Youngstown
- Metal Heat Treating, Youngstown
- Metal Lockers, Youngstown
- Metal Plating & Polishing, Youngstown
- Metal Repair Service & Blacksmith, Youngstown - Iron Works
- Metal Services, Youngstown
- Metal Stampings Manufacturers, Youngstown
- Metal Tablets, Youngstown
- Metal Working Machinery, Youngstown
- Methodist Church, Youngstown
- Mexican Restaurants, Youngstown
- Middle Eastern Restaurants, Youngstown
- Midwives, Youngstown
- Mildew Removal & Control, Youngstown - Mold Removal
- Military And Veteran Attorneys & Lawyers, Youngstown
- Military And Veteran Attorneys & Lawyers, Youngstown
- Military And Veteran Lawyers & Attorneys, Youngstown
- Millwork Manufacturers, Youngstown
- Mineral Wool Manufacturers, Youngstown
- Mini & Self Storage, Youngstown
- Mini Golf Courses, Youngstown
- Mining, Youngstown
- Ministers, Youngstown
- Ministries Church, Youngstown
- Mirrors, Youngstown - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Youngstown
- Miscellaneous Household Item Repair, Youngstown
- Miscellaneous Agriculture, Youngstown
- Miscellaneous Business Services, Youngstown
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Youngstown
- Miscellaneous Government, Youngstown
- Miscellaneous Industry, Youngstown
- Miscellaneous Manufacturing, Youngstown
- Miscellaneous Metal Work Manufacturers, Youngstown
- Miscellaneous Personal Services, Youngstown
- Miscellaneous Photographers, Youngstown
- Miscellaneous Professional, Youngstown
- Mobile Communications 2 Way Radios Sales & Service, Youngstown
- Mobile Home Contractors, Youngstown
- Mobile Home Improvements & Repairs, Youngstown
- Mobile Home Parks & Communities , Youngstown
- Modeling & Talent Agencies, Youngstown
- Molds Manufacturers, Youngstown
- Money Transfer Service, Youngstown
- Monuments, Tombstones, Markers & Memorials, Youngstown
- Mortgage Bankers & Correspondents, Youngstown
- Mortgage Companies, Youngstown
- Motion Picture Pre & Post Production Services, Youngstown
- Motion Pictures Video Tape Duplication & Transfer Services, Youngstown
- Motor Vehicle, Youngstown
- Motor Vehicle Rental & Leasing, Youngstown
- Motorcycle Parts, Accessories & Dealers, Youngstown
- Motorcycle Wreckers, Youngstown
- Movie Theaters, Youngstown
- Moving & Storage Supplies & Equipment, Youngstown
- Moving Companies, Youngstown
- Moving Services - Labor & Material, Youngstown
- Moving Supplies & Equipment Rental, Youngstown
- Moving Truck Rental , Youngstown
- Mowing Service, Youngstown
- Muffler Shop & Exhaust Systems, Youngstown
- Mulch, Peat & Moss Products, Youngstown
- Museums, Youngstown
- Music, Youngstown
- Music Entertainment, Youngstown
- Music Lessons, Youngstown
- Music Lessons - Instrumental, Youngstown
- Music Lessons - Vocal, Youngstown
- Music Production Services, Youngstown
- Music Sheet, Youngstown
- Music Stores Retail, Youngstown
- Musical Instruments & Equipment Stores, Youngstown
- Musical Instruments Repair, Sales & Service, Youngstown
- Musical Recording Services, Youngstown
- Musicians, Bands & Disc Jockeys, Youngstown
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