- Machinery, Supplies & Equipment - Business Supplies Related, Boalsburg
- Management Consultants & Services, Boalsburg
- Manicurists & Pedicurists, Boalsburg
- Manufacturing, Boalsburg
- Market Research & Analysis , Boalsburg - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Boalsburg
- Masonry Materials & Supplies, Boalsburg
- Membership Sports & Recreation Clubs, Boalsburg
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- Mental Health Specialists, Boalsburg - Psychologist, Psychiatrist, Psychotherapist, etc
- Miscellaneous Government, Boalsburg
- Miscellaneous Photographers, Boalsburg
- Miscellaneous Professional, Boalsburg
- Mortgage Companies, Boalsburg
- Motor Vehicle, Boalsburg
- Museums, Boalsburg
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