Carlisle is a city located in Pennsylvania. With a 2020 population of 18,906, it is the 31st largest city in Pennsylvania and the 1935th largest city in the United States. Carlisle is currently declining at a rate of -0.76% annually but its population has increased by 1.20% since the most recent census, which recorded a population of 18,682 in 2010. Carlisle reached it's highest population of 19,219 in 2016. Spanning over 6 miles, Carlisle has a population density of 3,417 people per square mile.
The average household income in Carlisle is $69,730 with a poverty rate of 15.46%. The median rental costs in recent years comes to $852 per month, and the median house value is $185,500. The median age in Carlisle is 34.1 years, 32.5 years for males, and 36 years for females. For every 100 females there are 93.1 males.