Port Royal is an incorporated town in Caroline County, Virginia, United States. Port Royal was established in the mid-17th century in the Colony of Virginia primary as a port on a navigable portion of the Rappahannock River for export of tobacco, Virginia's cash crop. Along an early stage road, it later became a crossroads along the busy modern highways of U.S. Route 17 and U.S. Route 301.According to the United States Census Bureau, the town has a total area of 0.1 square miles (0.3 Square Kilometer), all of it land. Local tradition holds that Port Royal was named after the Roy family. Dorothy Roy and her husband John owned a warehouse chartered by the crown, a ferry service across the Rappahannock River to King George County and a tavern. In the 21st century, the chimneys of the Roy house are preserved landmarks in the town.