Donaldson, PA has a population of 260 and is the 23,219th largest city in the United States. The population density is 2,283 per sq mi which is 724% higher than the Pennsylvania average and 2420% higher than the national average. The median age in Donaldson is 39 which is approximately 4% lower than the Pennsylvania average of 41. In Donaldson, 54% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 96% of Donaldson residents were born in Pennsylvania, 4% were born out of state, 0% were born outside of the United States and 0% were foreign born.