Allensville, PA has a population of 478 and is the 19,810th largest city in the United States. The population density is 243 per sq mi which is 12% lower than the Pennsylvania average and 168% higher than the national average. The median age in Allensville is 33 which is approximately 19% lower than the Pennsylvania average of 41. In Allensville, 64% of the population over 15 years of age are married, 51% speak English and 0% speak Spanish. 94% of Allensville residents were born in Pennsylvania, 6% were born out of state, 0% were born outside of the United States and 0% were foreign born.