- Machine Shop & Tool Repair Service, Harrisburg
- Machinery, Supplies & Equipment - Business Production Related, Harrisburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Harrisburg
- Mailing, Delivery & Courier Service, Harrisburg
- Maintenance, Cleaning & Sanitation, Harrisburg
- Major Appliances, Harrisburg - Household & Kitchen
- Manicurists & Pedicurists, Harrisburg
- Manufacturing, Harrisburg
- Marriage & Family Counselors, Harrisburg
- Masonry Materials & Supplies, Harrisburg
- Meat Cutting Services, Harrisburg
- Meat Market, Wholesale & Products, Harrisburg
- Medical Diagnostic Equipment Mobile, Harrisburg
- Medical Supplies & Equipment, Harrisburg
- Mennonite Church, Harrisburg
- Mildew Removal & Control, Harrisburg - Mold Removal
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- Mining, Harrisburg
- Miscellaneous Agriculture, Harrisburg
- Miscellaneous Government, Harrisburg
- Miscellaneous Manufacturing, Harrisburg
- Miscellaneous Personal Services, Harrisburg
- Miscellaneous Professional, Harrisburg
- Mobile Home Contractors, Harrisburg
- Mobile Home Improvements & Repairs, Harrisburg
- Mobile Home Parks & Communities , Harrisburg
- Modular & Mobile Homes For Sale, Harrisburg - Manufactured Homes Sale & Service
- Motor Homes Manufacturers, Harrisburg
- Motor Vehicle, Harrisburg
- Motor Vehicle Rental & Leasing, Harrisburg
- Motorcycle Parts, Accessories & Dealers, Harrisburg
- Moving Truck Rental , Harrisburg
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