Marysville is a borough in Perry County, Pennsylvania, United States. The population was 2,534 at the 2010 census. It is part of the Harrisburg–Carlisle Metropolitan Statistical Area.
The Borough was settled in 1755, incorporated as the Borough of Haley in 1866, and re-incorporated as the Borough of Marysville in 1867.
The Rockville Bridge was added to the National Register of Historic Places in 1975.
Marysville is located at 40°20′28″N 76°55′59″W (40.342287, -76.931463).
According to the United States Census Bureau, the borough has a total area of 2.4 square miles (6.2 km2), all of it land.
Marysville is bordered by Blue Mountain to the South, by the Susquehanna River to the east, by Cove Mountain to the North, and by Rye Township to the west. U.S. Route 11/15 passes through the town from North to South, and Pennsylvania Route 850 ends here.
As of the census of 2000, there were 2,306 people, 1,027 households, and 635 families residing in the borough. The population density was 966.8 people per square mile (372.5/km2). There were 1,103 housing units at an average density of 462.4 per square mile (178.2/km2).