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°18′29″N 76°35′38″W (40.307960, -76.593782).
According to the United States Census Bureau, the borough has a total area of 1.9 square miles (4.9 km2), 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 10 mi (16 km) west of Lebanon, and 17 mi (27 km) east of Harrisburg. The village of Campbelltown is only 2 mi (3.2 km) 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.