Port Royal is a borough in Juniata County, Pennsylvania, United States. The population was 815 at the 2020 census. Port Royal used to be named Perrysville, after Commodore Oliver Hazard Perry. At the time, the Port Royal post office was located in Saint Tammany town, just across the Tuscarora Creek. However, the Pennsylvania Railroad brought incre…Port Royal is a borough in Juniata County, Pennsylvania, United States. The population was 815 at the 2020 census. Port Royal used to be named Perrysville, after Commodore Oliver Hazard Perry. At the time, the Port Royal post office was located in Saint Tammany town, just across the Tuscarora Creek. However, the Pennsylvania Railroad brought increased traffic through the area and prompted a move of the Port Royal post office into Perrysville in 1847. In 1874, the borough took on the name itself and Saint Tammany became known as Old Port.
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