- Hair Care Professionals, Duncannon
- Hardware Stores, Duncannon
- Hardwood Floors, Duncannon
- Head Start Centers, Duncannon
- Health & Fitness Program Consultants & Trainers, Duncannon
- Health & Medical, Duncannon
- Health And Medical Centers, Duncannon
- Health Clubs & Gymnasiums, Duncannon
- Healthcare Providers, Practitioners & Professionals, Duncannon
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- Heating & Air-Conditioning Contractors, Duncannon - HVAC Contractors - Installation, Repair, Replace Service, etc
- Heating Contractors, Duncannon - Heating Systems - Installation & Repair
- Highway Surfacing & Paving Contractors, Duncannon - Pavers - Paving Companies
- Holding Companies, Duncannon
- Home Health Care, Duncannon - Agencies & Services
- Homeowners Insurance, Duncannon
- Hospitals, Duncannon
- Hotel & Motel Management, Duncannon
- Hotels & Motels, Duncannon
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