: 113 During the colonial era, Scots-Irish settlers began to settle in the Cumberland Valley beginning in the early 1730s. The French-born fur trader James Le Tort may have built a cabin in the area as early as 1720. Carlisle also hosts Penn State Dickinson School of Law and Dickinson College. Carlisle Barracks is home of the United States Army Heritage and Education Center, an archives and museum complex open to the public. Army installations and the most senior military educational institution in the United States Army. Carlisle Barracks ranks among the oldest U.S. Army War College, located at the Carlisle Barracks, prepares high-level military personnel and civilians for strategic leadership responsibilities. In 2010, Forbes rated Carlisle and Harrisburg the second-best place to raise a family. 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. As of the 2020 census, the borough population was 20,118 Including suburbs in the neighboring townships, 37,695 live in the Carlisle urban cluster. Carlisle is located within the Cumberland Valley, a highly productive agricultural region. Carlisle is a borough in and the county seat of Cumberland County, Pennsylvania, United States.