- Machine Tools , Harrisburg
- Machinery, Supplies & Equipment - Business Production Related, Harrisburg
- Machinery, Supplies & Equipment - Business Supplies Related, Harrisburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Harrisburg
- Mailbox Rental Services, Harrisburg
- Mailing, Delivery & Courier Service, Harrisburg
- Maintenance, Cleaning & Sanitation, Harrisburg
- Management Consultants & Services, Harrisburg
- Manicurists & Pedicurists, Harrisburg
- Manufacturing, Harrisburg
- Manufacturing Products, Harrisburg
- Marriage & Family Counselors, Harrisburg
- Martial Arts & Self Defense Schools, Harrisburg
- Masonry Materials & Supplies, Harrisburg
- Massage Therapy, Harrisburg
- Medical Diagnostic Clinics, Harrisburg - Clinical Labs & Centers
- Medical Supplies & Equipment, Harrisburg
- Meeting & Event Planning Services, Harrisburg - Conference Consultants
- Membership Sports & Recreation Clubs, Harrisburg
- Mental Health Specialists, Harrisburg - Psychologist, Psychiatrist, Psychotherapist, etc
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- Merchandise Sales Events, Harrisburg
- Metal Buildings, Harrisburg - Wood Buildings
- Methodist Church, Harrisburg
- Mexican Restaurants, Harrisburg
- Mildew Removal & Control, Harrisburg - Mold Removal
- Mini & Self Storage, Harrisburg
- Miscellaneous Household Item Repair, Harrisburg
- Miscellaneous Government, Harrisburg
- Miscellaneous Personal Services, Harrisburg
- Miscellaneous Professional, Harrisburg
- Mortgages & Loans, Harrisburg
- Motion Picture Pre & Post Production Services, Harrisburg
- Motor Vehicle, Harrisburg
- Motor Vehicle Rental & Leasing, Harrisburg
- Moving & Storage Supplies & Equipment, Harrisburg
- Moving Supplies & Equipment Rental, Harrisburg
- Moving Truck Rental , Harrisburg
- Mowing Service, Harrisburg
- Muffler Shop & Exhaust Systems, Harrisburg
- Mulch, Peat & Moss Products, Harrisburg
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