Carlisle is a city located in Cumberland County Pennsylvania. It is also the county seat of Cumberland County. With a 2020 population of 19,236, it is the 30th largest city in Pennsylvania and the 1920th largest city in the United States . Carlisle is currently growing at a rate of 0.10% annually and its population has increased by 2.97% since the most recent census, which recorded a population of 18,682 in 2010. Carlisle reached it's highest population of in . Spanning over 6 miles, Carlisle has a population density of 3,477 people per square mile.
The average household income in Carlisle is $68,884 with a poverty rate of 15.75%. The median rental costs in recent years comes to $844 per month, and the median house value is $187,800. The median age in Carlisle is 33.4 years, 32.4 years for males, and 34.5 years for females.