- Machine Tools , Canonsburg
- Machinery And Equipment Manufacturers, Canonsburg
- Machinery, Supplies & Equipment - Business Production Related, Canonsburg
- Machinery, Supplies & Equipment - Business Supplies Related, Canonsburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Canonsburg
- Magazine & Newspaper Stands, Canonsburg - Dealers & Distributors
- Magistrate Courts, Canonsburg
- Mail Delivery Service, Canonsburg
- Mailing, Delivery & Courier Service, Canonsburg
- Major Appliances, Canonsburg - Household & Kitchen
- Management Consultants & Services, Canonsburg
- Manholes & Manhole Covers Manufacturers, Canonsburg
- Manicurists & Pedicurists, Canonsburg
- Manufacturers Agents & Representatives, Canonsburg
- Manufacturers Representative, Canonsburg - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Canonsburg
- Manufacturing Products, Canonsburg
- Map Publishers & Printers, Canonsburg
- Mapping & Topographical Services, Canonsburg
- Marketing Schools, Canonsburg
- Marriage & Family Counselors, Canonsburg
- Martial Arts & Self Defense Schools, Canonsburg
- Masonry Materials & Supplies, Canonsburg
- Massage Therapists & Professional, Canonsburg
- Massage Therapy, Canonsburg
- Mausoleums Developers, Canonsburg
- Meat Market, Wholesale & Products, Canonsburg
- Medical & Health Service Organizations, Canonsburg
- Medical Diagnostic Clinics, Canonsburg - Clinical Labs & Centers
- Medical Equipment Manufacturers, Canonsburg
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Canonsburg
- Medical Supplies & Equipment, Canonsburg
- Mediterranean Restaurants, Canonsburg
- Membership Sports & Recreation Clubs, Canonsburg
- Men's Clothing Stores, Canonsburg - Clothes & Accessories
- Mental Health Specialists, Canonsburg - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Canonsburg
- Metal Buildings, Canonsburg - Wood Buildings
- Metal Buildings, Canonsburg - Kits, Homes, Steel Buildings, etc
- Metal Coating & Allied Services, Canonsburg
- Metal Pigment & Paint Products, Canonsburg
- Metal Repair Service & Blacksmith, Canonsburg - Iron Works
- Metal Roll Forming Manufacturers, Canonsburg
- Meteorologists, Canonsburg
- Methodist Church, Canonsburg
- Mexican Restaurants, Canonsburg
- Minerals, Canonsburg
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- Mini & Self Storage, Canonsburg
- Mining, Canonsburg
- Mining Consultants, Canonsburg
- Mining Contractors, Canonsburg - Mining Companies, Contractors & Brokers
- Mining Equipment & Supplies, Canonsburg
- Mining Equipment & Supplies Service & Repair, Canonsburg
- Mining, Crude-Oil Production, Canonsburg - Mining Companies
- Ministries Church, Canonsburg
- Mirrors, Canonsburg - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Credit Institutions & Services, Canonsburg
- Miscellaneous Business Product Repair, Canonsburg
- Miscellaneous Household Item Repair, Canonsburg
- Miscellaneous Prosthesis & Appliances, Canonsburg
- Miscellaneous Agriculture, Canonsburg
- Miscellaneous Business Services, Canonsburg
- Miscellaneous Government, Canonsburg
- Miscellaneous Industry, Canonsburg
- Miscellaneous Manufacturing, Canonsburg
- Miscellaneous Metal Work Manufacturers, Canonsburg
- Miscellaneous Personal Services, Canonsburg
- Miscellaneous Photographers, Canonsburg
- Miscellaneous Professional, Canonsburg
- Mobile Lube Systems, Canonsburg
- Monuments, Tombstones, Markers & Memorials, Canonsburg
- Mortgage Bankers & Correspondents, Canonsburg
- Motion Picture & Television Production Services, Canonsburg
- Motion Picture Pre & Post Production Services, Canonsburg
- Motor Vehicle, Canonsburg
- Motor Vehicle Rental & Leasing, Canonsburg
- Motorcycle & Motor Scooters Dealers, Repair & Service, Canonsburg
- Motorcycle Parts, Accessories & Dealers, Canonsburg
- Motorcycle Repair & Service, Canonsburg
- Moving Companies, Canonsburg
- Moving Services - Labor & Material, Canonsburg
- Moving Supplies & Equipment Rental, Canonsburg
- Moving Truck Rental , Canonsburg
- Muffler Shop & Exhaust Systems, Canonsburg
- Music, Canonsburg
- Music Lessons, Canonsburg
- Music Lessons - Instrumental, Canonsburg
- Music Lessons - Vocal, Canonsburg
- Music Schools, Canonsburg
- Musical Instrument Rental, Canonsburg - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Canonsburg
- Musical Instruments Repair, Sales & Service, Canonsburg
- Musical Recording Services, Canonsburg
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