Carlisle is a borough in and the county seat of Cumberland County, Pennsylvania, United States. The name is traditionally pronounced with emphasis on the second syllable. Carlisle is located within the Cumberland Valley, a highly productive agricultural region. As of the 2010 census, the borough population was 19,262. Including suburbs in the neighboring townships, 37,695 live in the Carlisle urban cluster. Carlisle also is an exurb of Harrisburg, Pennsylvania, to the east.
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, caters to high-level military personnel and civilians and prepares them for strategic leadership responsibilities. Carlisle Barracks ranks among the oldest installations in the and the most senior military educational institution in the United States Army. Carlisle Barracks is home of the United States Army Military Heritage Museum.