- Machine Shop, Dallastown
- Machinery And Equipment Manufacturers, Dallastown
- Machinery, Supplies & Equipment - Business Production Related, Dallastown
- Machinery, Supplies & Equipment - Business Supplies Related, Dallastown
- Machinery, Supplies & Equipment - Construction & Contractor Related, Dallastown
- Maintenance, Cleaning & Sanitation, Dallastown
- Major Appliances, Dallastown - Household & Kitchen
- Manufacturing, Dallastown
- Manufacturing & Industrial Consultants, Dallastown
- Masonry Contractors, Dallastown - Stone Mason, Brick Mason - Install & Repair
- Meat Market, Wholesale & Products, Dallastown
- Mechanical Contractors, Dallastown - Install, Service & Repair
- Medical Supplies & Equipment, Dallastown
- Membership Sports & Recreation Clubs, Dallastown
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- Metal Coating & Allied Services, Dallastown
- Metal Repair Service & Blacksmith, Dallastown - Iron Works
- Methodist Church, Dallastown
- Mildew Removal & Control, Dallastown - Mold Removal
- Mirrors, Dallastown - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Government, Dallastown
- Miscellaneous Industry, Dallastown
- Miscellaneous Personal Services, Dallastown
- Miscellaneous Professional, Dallastown
- Motor Vehicle, Dallastown
- Motorcycle & ATV Repair & Service, Dallastown
- Motorcycle & Motor Scooters Dealers, Repair & Service, Dallastown
- Motorcycle Repair & Service, Dallastown
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