Dallastown, PA has a population of 3,816 and is the 7,655th largest city in the United States. The population density is 4,905 per sq mi which is 1670% higher than the Pennsylvania average and 5314% higher than the national average. The median age in Dallastown is 42 which is approximately 4% higher than the Pennsylvania average of 41. In Dallastown, 57% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 69% of Dallastown residents were born in Pennsylvania, 28% were born out of state, 0% were born outside of the United States and 3% were foreign born.