Millheim, PA has a population of 809 and is the 16,527th largest city in the United States. The population density is 611 per sq mi which is 121% higher than the Pennsylvania average and 575% higher than the national average. The median age in Millheim is 40 which is approximately 1% lower than the Pennsylvania average of 41. In Millheim, 67% of the population over 15 years of age are married, 98% speak English and 0% speak Spanish. 82% of Millheim residents were born in Pennsylvania, 17% were born out of state, 0% were born outside of the United States and 1% were foreign born.