Dallastown is a borough in York County, Pennsylvania, United States.

Settled in 1736, the town was renamed after George M. Dallas of Philadelphia (Vice President of the United States during the Polk administration) during the presidential campaign of 1844.

President Lyndon Johnson visited Dallastown in 1966 as part of the town's centennial celebration.

According to the U.S. Census Bureau, the borough has a total area of 0.8 square miles (2.1 km2), all land.

It provided Catholic education to students in grades Pre-K to 6.