- Machinery, Supplies & Equipment - Business Supplies Related, West Mifflin
- Machinery, Supplies & Equipment - Construction & Contractor Related, West Mifflin
- Major Appliances, West Mifflin - Household & Kitchen
- Malls & Shopping Centers, West Mifflin
- Management Training & Development, West Mifflin
- Manicurists & Pedicurists, West Mifflin
- Manufacturers Agents & Representatives, West Mifflin
- Manufacturers Representative, West Mifflin - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, West Mifflin
- Manufacturing Products, West Mifflin
- Marble & Terrazzo Flooring - Cleaning & Service, West Mifflin
- Marble Contractors, West Mifflin - Installation, Cleaning & Removal Services
- Martial Arts & Self Defense Schools, West Mifflin
- Masonry Contractors, West Mifflin - Stone Mason, Brick Mason - Install & Repair
- Material Handling Equipment, West Mifflin - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, West Mifflin
- Mechanical Engineer, West Mifflin - Mechanical Engineering Service
- Medical & Health Service Organizations, West Mifflin
- Medical Diagnostic Clinics, West Mifflin - Clinical Labs & Centers
- Medical Research Facilities, West Mifflin - Research & Development Centers
- Medical Supplies & Equipment, West Mifflin
- Medical Uniform Accessories, West Mifflin
- Men's Clothing Stores, West Mifflin - Clothes & Accessories
- Mental Health Specialists, West Mifflin - Psychologist, Psychiatrist, Psychotherapist, etc
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- Metal Heat Treating, West Mifflin
- Mexican Restaurants, West Mifflin
- Mini & Self Storage, West Mifflin
- Mining, West Mifflin
- Ministries Church, West Mifflin
- Miscellaneous Government, West Mifflin
- Miscellaneous Industry, West Mifflin
- Miscellaneous Manufacturing, West Mifflin
- Miscellaneous Personal Services, West Mifflin
- Miscellaneous Photographers, West Mifflin
- Miscellaneous Professional, West Mifflin
- Modular & Mobile Homes For Sale, West Mifflin - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, West Mifflin
- Mortgage Companies, West Mifflin
- Motor Vehicle, West Mifflin
- Motor Vehicle Rental & Leasing, West Mifflin
- Motorcycle Parts, Accessories & Dealers, West Mifflin
- Moving Companies, West Mifflin
- Moving Supplies & Equipment Rental, West Mifflin
- Moving Truck Rental , West Mifflin
- Muffler Shop & Exhaust Systems, West Mifflin
- Museums, West Mifflin
- Music, West Mifflin
- Musical Recording Services, West Mifflin
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