Castle Shannon is a city located in Pennsylvania. With a 2020 population of 8,129, it is the 95th largest city in Pennsylvania and the 3582nd largest city in the United States. Castle Shannon is currently declining at a rate of -0.77% annually and its population has decreased by -2.25% since the most recent census, which recorded a population of 8,316 in 2010. Castle Shannon reached it's highest population of 12,036 in 1970. Spanning over 2 miles, Castle Shannon has a population density of 5,091 people per square mile.
The average household income in Castle Shannon is $70,187 with a poverty rate of 8.35%. The median rental costs in recent years comes to $799 per month, and the median house value is $124,400. The median age in Castle Shannon is 41.5 years, 39.1 years for males, and 45.4 years for females. For every 100 females there are 98.1 males.