- Labor Organizations, Hummelstown
- Laboratories Dental, Hummelstown
- Laboratories Medical, Hummelstown
- Landscape Contractors & Designers, Hummelstown
- Landscaping, Hummelstown
- Lawn & Garden Equipment & Supplies, Hummelstown
- Lawn & Garden Services, Hummelstown
- Lawn Maintenance Services, Hummelstown
- Lawn Mowers & Power Equipment, Hummelstown
- Lawyers & Attorneys, Hummelstown
- Legal & Tax Services, Hummelstown
- Legal Professionals, Hummelstown
- Libraries, Hummelstown
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- Life Insurance, Hummelstown
- Lighting Fixtures & Equipment, Hummelstown
- Lions Clubs, Hummelstown
- Liquor Stores, Hummelstown
- Loans Personal, Hummelstown
- Locks, Hummelstown
- Locksmiths, Hummelstown - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Hummelstown
- Lodging, Hummelstown
- Lodging Services, Hummelstown
- Long Haul Trucking Companies, Hummelstown
- Lutheran Church, Hummelstown
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