- Machine Shop & Tool Repair Service, Leechburg
- Machinery And Equipment Manufacturers, Leechburg
- Machinery, Supplies & Equipment - Business Production Related, Leechburg
- Mailing, Delivery & Courier Service, Leechburg
- Major Appliances, Leechburg - Household & Kitchen
- Management Consultants & Services, Leechburg
- Manicurists & Pedicurists, Leechburg
- Manufacturing, Leechburg
- Manufacturing Products, Leechburg
- Marriage & Family Counselors, Leechburg
- Masonry Contractors, Leechburg - Stone Mason, Brick Mason - Install & Repair
- Mental Health Specialists, Leechburg - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Plating & Polishing, Leechburg
- Metal Repair Service & Blacksmith, Leechburg - Iron Works
- Methodist Church, Leechburg
- Minerals, Leechburg
- Mini & Self Storage, Leechburg
- Miscellaneous Agriculture, Leechburg
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- Miscellaneous Government, Leechburg
- Miscellaneous Industry, Leechburg
- Miscellaneous Personal Services, Leechburg
- Miscellaneous Professional, Leechburg
- Motor Vehicle, Leechburg
- Motor Vehicle Rental & Leasing, Leechburg
- Motorcycle & ATV Repair & Service, Leechburg
- Motorcycle & Motor Scooters Dealers, Repair & Service, Leechburg
- Motorcycle Parts, Accessories & Dealers, Leechburg
- Motorcycle Repair & Service, Leechburg
- Moving Supplies & Equipment Rental, Leechburg
- Moving Truck Rental , Leechburg
- Muffler Shop & Exhaust Systems, Leechburg
- Museums, Leechburg
- Music, Leechburg
- Musical Instrument Rental, Leechburg - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Leechburg
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