New Castle is a city located in Pennsylvania. With a 2020 population of 21,357, it is the 25th largest city in Pennsylvania and the 1756th largest city in the United States. New Castle is currently declining at a rate of -1.02% annually and its population has decreased by -8.23% since the most recent census, which recorded a population of 23,273 in 2010. New Castle reached it's highest population of 48,834 in 1950. Spanning over 9 miles, New Castle has a population density of 2,571 people per square mile.
The average household income in New Castle is $46,560 with a poverty rate of 26.52%. The median rental costs in recent years comes to $680 per month, and the median house value is $63,700. The median age in New Castle is 42.2 years, 39.5 years for males, and 44.8 years for females. For every 100 females there are 93.1 males.