Eighty Four, PA has a population of 705 and is the 17,433rd largest city in the United States. The population density is 107 per sq mi which is 61% lower than the Pennsylvania average and 18% higher than the national average. The median age in Eighty Four is 40 which is approximately 1% lower than the Pennsylvania average of 41. In Eighty Four, 63% of the population over 15 years of age are married, 98% speak English and 0% speak Spanish. 88% of Eighty Four residents were born in Pennsylvania, 11% were born out of state, 0% were born outside of the United States and 1% were foreign born.