Hellertown, PA has a population of 5,837 and is the 5,855th largest city in the United States. The population density is 4,450 per sq mi which is 1506% higher than the Pennsylvania average and 4812% higher than the national average. The median age in Hellertown is 41 which is approximately equal to the Pennsylvania average of 41. In Hellertown, 55% of the population over 15 years of age are married, 91% speak English and 4% speak Spanish. 75% of Hellertown residents were born in Pennsylvania, 19% were born out of state, 2% were born outside of the United States and 4% were foreign born.