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Royalton is a borough in Dauphin County, Pennsylvania, United States. As of the 2010 census the borough population was 907. It is part of the Harrisburg–Carlisle Metropolitan Statistical Area. It shares its ZIP code with neighboring Middletown.
Royalton is located in southern Dauphin County at 40°11′18″N 76°43′38″W (40.188325, -76.727280). 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. Harrisburg, the state capital, is 11 miles (18 km) to the northwest (upriver).
According to the United States Census Bureau, the borough of Royalton has a total area of 0.34 square miles (0.87 km2), of which 0.30 square miles (0.78 km2) is land and 0.03 square miles (0.08 km2), or 9.48%, is water.
As of the census of 2010, there were 1083 people, 395 households, and 270 families residing in the borough. The population density was 2,774.8 people per square mile (1,062.3/km²).