Clymer is a borough in Indiana County, Pennsylvania, United States. The population was 1,357 at the 2010 census. The community was named after George Clymer, one of the signers of the United States Declaration of Independence. It is surrounded by but separate from Cherryhill Township.
Clymer is located at 40°40′8″N 79°0′43″W (40.668977, -79.011925).
According to the United States Census Bureau, the borough has a total area of 0.6 square miles (1.6 km2), all of it land.
At the 2000 census there were 1,547 people in 679 households, including 418 families, in the borough. The population density was 2,606.6 people per square mile (1,012.4/km²). There were 734 housing units at an average density of 1,236.8 per square mile (480.3/km²). The racial makeup of the borough was 99.55% White, 0.19% Native American, 0.06% Asian, 0.06% from other races, and 0.13% from two or more races. Hispanic or Latino of any race were 0.19%.
There were 679 households, 27.0% had children under the age of 18 living with them, 44.9% were married couples living together, 12.5% had a female householder with no husband present, and 38.3% were non-families.