Heidlersburg, PA has a population of 755 and is the 16,994th largest city in the United States. The population density is 698 per sq mi which is 152% higher than the Pennsylvania average and 670% higher than the national average. The median age in Heidlersburg is 34 which is approximately 16% lower than the Pennsylvania average of 41. In Heidlersburg, 62% of the population over 15 years of age are married, 75% speak English and 25% speak Spanish. 61% of Heidlersburg residents were born in Pennsylvania, 25% were born out of state, 1% were born outside of the United States and 14% were foreign born.