Carlisle is a borough in and the county seat of Cumberland County, Pennsylvania, United States. Carlisle is located within the Cumberland Valley, a highly productive agricultural region. As of the 2010 census, the borough population was 18,682; the estimated population as of 2019 was 19,198. Including suburbs in the neighboring townships, 37,695 live in the Carlisle urban cluster. Carlisle is the smaller principal city of the Harrisburg−Carlisle Metropolitan Statistical Area, which includes all of Cumberland, Dauphin, and Perry counties in South Central Pennsylvania. In 2010, Forbes rated Carlisle and Harrisburg the second-best place to raise a family.
The U.S. Army War College, located at the Carlisle Barracks, prepares high-level military personnel and civilians for strategic leadership responsibilities. Carlisle Barracks ranks among the oldest U.S. Army installations and the most senior military educational institution in the United States Army. Carlisle Barracks is home of the United States Army Heritage and Education Center, an archives and museum complex open to the public. Carlisle also hosts Penn State Dickinson School of Law and Dickinson College.