- Machine Shop, Johnstown
- Machine Shop & Tool Repair Service, Johnstown
- Machinery, Supplies & Equipment - Business Production Related, Johnstown
- Machinery, Supplies & Equipment - Business Supplies Related, Johnstown
- Machinery, Supplies & Equipment - Construction & Contractor Related, Johnstown
- Magazine & Newspaper Stands, Johnstown - Dealers & Distributors
- Mail Delivery Service, Johnstown
- Mailbox Rental Services, Johnstown
- Mailing List Service, Brokers & Compilers, Johnstown
- Mailing, Delivery & Courier Service, Johnstown
- Major Appliances, Johnstown - Household & Kitchen
- Malls & Shopping Centers, Johnstown
- Malpractice Attorneys & Lawyers, Johnstown
- Malpractice Attorneys & Lawyers, Johnstown
- Malpractice Lawyers & Attorneys, Johnstown
- Mammography Clinics, Johnstown - Breast Cancer Screening
- Management Consultants & Services, Johnstown
- Mandarin Restaurants, Johnstown
- Manicurists & Pedicurists, Johnstown
- Manufacturing, Johnstown
- Manufacturing Products, Johnstown
- Marine Supplies & Equipment, Johnstown - Boat Supplies
- Market Research & Analysis , Johnstown - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Johnstown
- Martial Arts & Self Defense Schools, Johnstown
- Masonry Contractors, Johnstown - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Johnstown
- Massage Therapists & Professional, Johnstown
- Massage Therapy, Johnstown
- Mastectomy Apparel, Forms, Prostheses & Supplies, Johnstown
- Mats & Matting, Johnstown
- Mausoleums Developers, Johnstown
- Meat Market, Wholesale & Products, Johnstown
- Mechanical Contractors, Johnstown - Install, Service & Repair
- Mechanical Engineer, Johnstown - Mechanical Engineering Service
- Medical & Dental Management, Johnstown
- Medical & Health Service Organizations, Johnstown
- Medical Alert Systems, Johnstown - Medical Alarms - PERS
- Medical Billing Services, Johnstown
- Medical Business Management Services, Johnstown
- Medical Identification Jewelry, Johnstown
- Medical Management & Business Administration Service, Johnstown
- Medical Research, Johnstown
- Medical Research & Development, Johnstown - Medical Information & Research
- Medical Supplies & Equipment, Johnstown
- Medical Transcription Service, Johnstown
- Mediterranean Restaurants, Johnstown
- Membership Sports & Recreation Clubs, Johnstown
- Memorial Libraries, Johnstown
- Men's Clothing Stores, Johnstown - Clothes & Accessories
- Mennonite Church, Johnstown
- Mental Health Clinics, Johnstown - Treatment Centers
- Mental Health Specialists, Johnstown - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Johnstown
- Metal Buildings, Johnstown - Kits, Homes, Steel Buildings, etc
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- Metal Galvanizing, Johnstown
- Metal Plating & Polishing, Johnstown
- Metal Products, Johnstown
- Metal Repair Service & Blacksmith, Johnstown - Iron Works
- Metal Specialties, Johnstown
- Metal Working Machinery, Johnstown
- Methodist Church, Johnstown
- Mexican Restaurants, Johnstown
- Microwave Oven Repair & Service, Johnstown
- Mini Golf Courses, Johnstown
- Mining, Johnstown
- Mining Services, Johnstown
- Miscellaneous Business Product Repair, Johnstown
- Miscellaneous Household Item Repair, Johnstown
- Miscellaneous Prosthesis & Appliances, Johnstown
- Miscellaneous Agriculture, Johnstown
- Miscellaneous Business Services, Johnstown
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Johnstown
- Miscellaneous Government, Johnstown
- Miscellaneous Industry, Johnstown
- Miscellaneous Manufacturing, Johnstown
- Miscellaneous Personal Services, Johnstown
- Miscellaneous Photographers, Johnstown
- Miscellaneous Professional, Johnstown
- Mobile Home Contractors, Johnstown
- Mobile Home Improvements & Repairs, Johnstown
- Mobile Home Parks & Communities , Johnstown
- Modular & Mobile Homes For Sale, Johnstown - Manufactured Homes Sale & Service
- Money Transfer Service, Johnstown
- Monuments, Tombstones, Markers & Memorials, Johnstown
- Mortgage Bankers & Correspondents, Johnstown
- Mortgage Companies, Johnstown
- Motion Picture & Television Production Services, Johnstown
- Motion Picture Pre & Post Production Services, Johnstown
- Motor Vehicle, Johnstown
- Motor Vehicle Rental & Leasing, Johnstown
- Motorcycle & ATV Repair & Service, Johnstown
- Motorcycle & Motor Scooters Dealers, Repair & Service, Johnstown
- Motorcycle Parts, Accessories & Dealers, Johnstown
- Motorcycle Repair & Service, Johnstown
- Movie Theaters, Johnstown
- Moving & Storage Supplies & Equipment, Johnstown
- Moving Companies, Johnstown
- Moving Truck Rental , Johnstown
- Muffler Shop & Exhaust Systems, Johnstown
- Mulch, Peat & Moss Products, Johnstown
- Multimedia Publishers, Johnstown - Multimedia Services & Systems
- Municipal Supplies, Johnstown
- Museums, Johnstown
- Music, Johnstown
- Music Entertainment, Johnstown
- Music Lessons, Johnstown
- Music Lessons - Instrumental, Johnstown
- Musical Instruments & Equipment Stores, Johnstown
- Musical Instruments Repair, Sales & Service, Johnstown
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