Orrstown, PA has a population of 256 and is the 23,314th largest city in the United States. The population density is 4,029 per sq mi which is 1354% higher than the Pennsylvania average and 4347% higher than the national average. The median age in Orrstown is 40 which is approximately 3% lower than the Pennsylvania average of 41. In Orrstown, 57% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 80% of Orrstown residents were born in Pennsylvania, 16% were born out of state, 2% were born outside of the United States and 2% were foreign born.