- Machine Shop & Tool Repair Service, Hummelstown
- Machinery, Supplies & Equipment - Business Supplies Related, Hummelstown
- Machinery, Supplies & Equipment - Construction & Contractor Related, Hummelstown
- Mail Delivery Service, Hummelstown
- Mailbox Rental Services, Hummelstown
- Mailing, Delivery & Courier Service, Hummelstown
- Major Appliances, Hummelstown - Household & Kitchen
- Management Consultants & Services, Hummelstown
- Manicurists & Pedicurists, Hummelstown
- Manufacturing, Hummelstown
- Manufacturing Products, Hummelstown
- Manufacturing Services, Hummelstown
- Marriage & Family Counselors, Hummelstown
- Martial Arts & Self Defense Schools, Hummelstown
- Masonry Contractors, Hummelstown - Stone Mason, Brick Mason - Install & Repair
- Material Handling & Heavy Machinery & Equipment, Hummelstown
- Meat Market, Wholesale & Products, Hummelstown
- Medical & Dental Management, Hummelstown
- Medical Equipment Manufacturers, Hummelstown
- Medical Supplies & Equipment, Hummelstown
- Medical Supplies Canes, Hummelstown
- Membership Sports & Recreation Clubs, Hummelstown
- Men's Clothing Stores, Hummelstown - Clothes & Accessories
- Mental Health Specialists, Hummelstown - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Hummelstown - Wood Buildings
- Metal Buildings, Hummelstown - Kits, Homes, Steel Buildings, etc
- Methodist Church, Hummelstown
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- Mexican Restaurants, Hummelstown
- Milk Bars, Hummelstown
- Millwrights, Hummelstown
- Mini & Self Storage, Hummelstown
- Mini Golf Courses, Hummelstown
- Miscellaneous Business Product Repair, Hummelstown
- Miscellaneous Agriculture, Hummelstown
- Miscellaneous Business Services, Hummelstown
- Miscellaneous Government, Hummelstown
- Miscellaneous Industry, Hummelstown
- Miscellaneous Personal Services, Hummelstown
- Miscellaneous Photographers, Hummelstown
- Miscellaneous Professional, Hummelstown
- Mortgage Bankers & Correspondents, Hummelstown
- Mortgages & Loans, Hummelstown
- Motor Vehicle, Hummelstown
- Motor Vehicle Rental & Leasing, Hummelstown
- Moving & Storage Supplies & Equipment, Hummelstown
- Moving Supplies & Equipment Rental, Hummelstown
- Moving Truck Rental , Hummelstown
- Museums, Hummelstown
- Music, Hummelstown
- Music Entertainment, Hummelstown
- Music Teachers, Hummelstown
- Musical Instrument Rental, Hummelstown - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Hummelstown
- Musicians, Bands & Disc Jockeys, Hummelstown
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