Erie, PA has a population of 100,157 and is the 311th largest city in the United States. The population density is 5,233 per sq mi which is 1788% higher than the Pennsylvania average and 5676% higher than the national average. The median age in Erie is 34 which is approximately 16% lower than the Pennsylvania average of 41. In Erie, 44% of the population over 15 years of age are married, 89% speak English and 4% speak Spanish. 75% of Erie residents were born in Pennsylvania, 16% were born out of state, 2% were born outside of the United States and 7% were foreign born.