Palmyra, Pennsylvania  Palmyra is a borough in Lebanon County, Pennsylvania, United States. It is part of the Lebanon, Pennsylvania Metropolitan statistical area. The population was 7,320 at the 2010 census. Palmyra is located at (40.307960, -76.593782). According to the United States Census Bureau, the borough has a total area of , all of it land. Palmyra is located in the Lebanon Valley between Annville and Hershey. Situated on the western edge of Lebanon County, the borough is west of Lebanon, and east of Harrisburg. The village of Campbelltown is only south of Palmyra, and carries a Palmyra mailing address. Although no water source runs directly through the borough, the Killinger, Quittapahilla, Spring, and Swatara Creeks are all nearby. Palmyra has a humid continental climate. Geologist William E. Kochanov wrote an extensive report on the geology of the Palmyra area as part of the 1995 publication, Karst Geohazards. In his article, Kochanov discusses how the geology of the region contributes to the high number of sinkholes found in the area. Palmyra lies in the eastern section of the Great Valley, locally known as the Lebanon Valley. The specific formation beneath Palmyra is an Ordovician Epler Formation, characterized by a high number of surface depressions and sinkholes. These features serve as natural drains, allowing any water on the surface to permeate the soil and run underground into water tables or into local springs or creeks. The development of the borough has interrupted the natural drainage systems present in the Epler Formation. Palmyra is, in reality, a waterless community. All of the natural drainage ways, including the Killinger, Quittapahilla, Spring and Swatara Creeks, lie outside the borough's municipal borders. The storm water runoff is directed outside the borough via a multitude of ways, and it is these discharge areas in which the appearance of sinkholes is most prevalent. Residents and legislators met in October 1993 to discuss possible solutions to the recurring sinkhole problems. The installation of a storm sewer system was widely supported, but the estimated $10 million cost was a major hurdle. Since the meeting, several projects have been introduced to correct some of the water flow problems of the borough. The land on which Palmyra rests was originally home to the Lenape and Susquehannock tribes. The first European explorers and traders came to the region around 1650.