- Machine Shop & Tool Repair Service, Parkersburg
- Machinery And Equipment Manufacturers, Parkersburg
- Machinery, Supplies & Equipment - Business Production Related, Parkersburg
- Machinery, Supplies & Equipment - Business Supplies Related, Parkersburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Parkersburg
- Magazine & Newspaper Stands, Parkersburg - Dealers & Distributors
- Magazine Ads, Parkersburg - Periodical Advertising
- Magistrate Courts, Parkersburg
- Mail Delivery Service, Parkersburg
- Mailing, Delivery & Courier Service, Parkersburg
- Maintenance, Cleaning & Sanitation, Parkersburg
- Major Appliances, Parkersburg - Household & Kitchen
- Make Up & Cosmetics Application, Parkersburg
- Malls & Shopping Centers, Parkersburg
- Malpractice Attorneys & Lawyers, Parkersburg
- Malpractice Lawyers & Attorneys, Parkersburg
- Management Consultants & Services, Parkersburg
- Manicurists & Pedicurists, Parkersburg
- Manifold Business Forms Manufacturers, Parkersburg
- Manufacturers Agents & Representatives, Parkersburg
- Manufacturers Representative, Parkersburg - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Parkersburg
- Manufacturing Products, Parkersburg
- Marinas & Marina Services, Parkersburg
- Markets & Grocers Equipment, Parkersburg
- Marriage & Family Counselors, Parkersburg
- Masonry Contractors, Parkersburg - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Parkersburg
- Massage Therapists & Professional, Parkersburg
- Massage Therapy, Parkersburg
- Material Handling & Heavy Machinery & Equipment, Parkersburg
- Material Handling Equipment, Parkersburg - Conveyor Belt, Pallet Jack, Forklift, etc
- Maternity Services, Parkersburg
- Mausoleums Developers, Parkersburg
- Meat Market, Wholesale & Products, Parkersburg
- Mechanical Contractors, Parkersburg - Install, Service & Repair
- Medical & Health Service Organizations, Parkersburg
- Medical & Infectious Waste Disposal, Parkersburg
- Medical Billing Services, Parkersburg
- Medical Supplies & Equipment, Parkersburg
- Membership Sports & Recreation Clubs, Parkersburg
- Mental Health Specialists, Parkersburg - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Parkersburg
- Merchandise Sales Events, Parkersburg
- Metal Buildings, Parkersburg - Kits, Homes, Steel Buildings, etc
- Metal Detecting Equipment, Parkersburg
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- Metal Repair Service & Blacksmith, Parkersburg - Iron Works
- Metal Stampings Manufacturers, Parkersburg
- Methodist Church, Parkersburg
- Mexican Restaurants, Parkersburg
- Middle Eastern Restaurants, Parkersburg
- Mildew Removal & Control, Parkersburg - Mold Removal
- Military And Veteran Attorneys & Lawyers, Parkersburg
- Military And Veteran Attorneys & Lawyers, Parkersburg
- Military And Veteran Lawyers & Attorneys, Parkersburg
- Milk Bars, Parkersburg
- Millwork Contractors, Parkersburg
- Mini & Self Storage, Parkersburg
- Mining, Parkersburg
- Ministries Church, Parkersburg
- Miscellaneous Household Item Repair, Parkersburg
- Miscellaneous Business Services, Parkersburg
- Miscellaneous Government, Parkersburg
- Miscellaneous Industry, Parkersburg
- Miscellaneous Manufacturing, Parkersburg
- Miscellaneous Metal Work Manufacturers, Parkersburg
- Miscellaneous Personal Services, Parkersburg
- Miscellaneous Photographers, Parkersburg
- Miscellaneous Professional, Parkersburg
- Mission Churches, Parkersburg
- Mobile Home Parks & Communities , Parkersburg
- Modular & Mobile Homes For Sale, Parkersburg - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Parkersburg
- Mortgage Bankers & Correspondents, Parkersburg
- Mortgage Companies, Parkersburg
- Mortgages & Loans, Parkersburg
- Motion Picture Pre & Post Production Services, Parkersburg
- Motor Vehicle, Parkersburg
- Motor Vehicle Rental & Leasing, Parkersburg
- Motorcycle Parts, Accessories & Dealers, Parkersburg
- Moving & Storage Consultants, Parkersburg
- Moving Companies, Parkersburg
- Moving Supplies & Equipment Rental, Parkersburg
- Moving Truck Rental , Parkersburg
- Muffler Shop & Exhaust Systems, Parkersburg
- Museums, Parkersburg
- Music, Parkersburg
- Music Entertainment, Parkersburg
- Music Lessons, Parkersburg
- Music Lessons - Instrumental, Parkersburg
- Musical Instruments & Equipment Stores, Parkersburg
- Musical Recording Services, Parkersburg
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