Dallastown is a borough in York County, Pennsylvania, United States. The population was 4,087 at the 2000 census.
Dallastown is named after George M. Dallas of Philadelphia (VP of the Polk Administration) during the presidential campaign of 1844. Dallastown was incorporated April 1866.
President Lyndon Johnson visited Dallastown in 1966 as part of the town's centennial celebration.