Chester, PA has a population of 34,056 and is the 1,246th largest city in the United States. The population density is 7,046 per sq mi which is 2442% higher than the Pennsylvania average and 7677% higher than the national average. The median age in Chester is 31 which is approximately 25% lower than the Pennsylvania average of 41. In Chester, 27% of the population over 15 years of age are married, 87% speak English and 9% speak Spanish. 74% of Chester residents were born in Pennsylvania, 17% were born out of state, 4% were born outside of the United States and 5% were foreign born.