Silverdale, PA has a population of 917 and is the 15,687th largest city in the United States. The population density is 2,218 per sq mi which is 673% higher than the Pennsylvania average and 2348% higher than the national average. The median age in Silverdale is 42 which is approximately 4% higher than the Pennsylvania average of 41. In Silverdale, 64% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 87% of Silverdale residents were born in Pennsylvania, 11% were born out of state, 1% were born outside of the United States and 1% were foreign born.