- Machine Shop & Tool Repair Service, Pennsburg
- Machine Shop Rotary Surface Grinding, Pennsburg - Tool Grinding & Sharpening
- Machinery Repair & Rebuild, Pennsburg
- Machinery, Supplies & Equipment - Business Production Related, Pennsburg
- Machinery, Supplies & Equipment - Business Supplies Related, Pennsburg
- Magazine & Newspaper Stands, Pennsburg - Dealers & Distributors
- Mailboxes Retail, Pennsburg
- Maintenance, Cleaning & Sanitation, Pennsburg
- Major Appliances, Pennsburg - Household & Kitchen
- Management Consultants & Services, Pennsburg
- Manicurists & Pedicurists, Pennsburg
- Manufacturing, Pennsburg
- Manufacturing Products, Pennsburg
- Martial Arts & Self Defense Schools, Pennsburg
- Masonry Contractors, Pennsburg - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Pennsburg
- Massage Therapists & Professional, Pennsburg
- Massage Therapy, Pennsburg
- Medical Identification Jewelry, Pennsburg
- Medical Supplies & Equipment, Pennsburg
- Mennonite Church, Pennsburg
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- Merchandise Sales Events, Pennsburg
- Metal Repair Service & Blacksmith, Pennsburg - Iron Works
- Mildew Removal & Control, Pennsburg - Mold Removal
- Mini & Self Storage, Pennsburg
- Mining, Pennsburg
- Miscellaneous Household Item Repair, Pennsburg
- Miscellaneous Agriculture, Pennsburg
- Miscellaneous Government, Pennsburg
- Miscellaneous Manufacturing, Pennsburg
- Miscellaneous Personal Services, Pennsburg
- Miscellaneous Photographers, Pennsburg
- Miscellaneous Professional, Pennsburg
- Motor Vehicle, Pennsburg
- Motor Vehicle Rental & Leasing, Pennsburg
- Moving & Storage Supplies & Equipment, Pennsburg
- Moving Truck Rental , Pennsburg
- Museums, Pennsburg
- Music, Pennsburg
- Music Lessons, Pennsburg
- Music Lessons - Instrumental, Pennsburg
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