Royalton is a borough in Dauphin County, Pennsylvania, United States.

[3] It was formed by combining the communities of Furnace Hill to the north and Port Royal to the south.

[4] Early industries included a sixty-foot planing mill that was built by John McCreary in 1891 and the Middletown Shale Brick Works, which was built in the borough's southeast section circa 1900 and operated by H. O.

[6] It is bordered to the southwest by the Susquehanna River, and to the west and north by Swatara Creek, across which is the borough of Middletown.

Pennsylvania Route 441 (Canal Street) passes through the center of the borough, leading north into Middletown and southeast (downriver) 18 miles (29 km) to Columbia.

26.3% of all households were made up of individuals, and 7.1% had someone living alone who was sixty-five years of age or older.