- Manicurists & Pedicurists, Steelton
- Manufacturing, Steelton
- Manufacturing Products, Steelton
- Market Research & Analysis , Steelton - Market Analysis, Business & Economic Research
- Meat Market, Wholesale & Products, Steelton
- Mechanical Contractors, Steelton - Install, Service & Repair
- Medical Supplies & Equipment, Steelton
- Membership Sports & Recreation Clubs, Steelton
- Mennonite Church, Steelton
- Mental Health Specialists, Steelton - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Steelton - Iron Works
- Mining, Steelton
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- Mining Contractors, Steelton - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Steelton - Mining Companies
- Ministries Church, Steelton
- Miscellaneous Government, Steelton
- Miscellaneous Manufacturing, Steelton
- Miscellaneous Professional, Steelton
- Mission Churches, Steelton
- Motor Vehicle, Steelton
- Motor Vehicle Rental & Leasing, Steelton
- Moving Supplies & Equipment Rental, Steelton
- Moving Truck Rental , Steelton
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