The crash occurred around 3 p.m. near Penn's Peak concert hall, a mountaintop entertainment venue in Jim Thorpe.
The Carbon County Coroner confirmed the fatalities, though the identities of the victims have not yet been released.
PPL Electric Utilities told WNEP that a third-party contractor was using a helicopter to work on utility lines in the area.
Officials have not provided details on what caused the crash.
The National Transportation Safety Board has been called to investigate.