Marysville is a borough in Perry County, Pennsylvania, United States.

The Rockville Bridge was added to the National Register of Historic Places in 1975.

[5] According to the United States Census Bureau, the borough has a total area of 2.4 square miles (6.2 km2), all land.

46.7% were married couples living together, 11.2% had a female householder with no husband present, and 38.1% were non-families.

31.3% of all households were made up of individuals, and 14.4% had someone living alone who was 65 years of age or older.