Carlisle is a borough in and the county seat of Cumberland County, Pennsylvania, United States. The name is locally pronounced as in British English with emphasis on the second syllable /krlal/. Carlisle is located within the Cumberland Valley, a highly productive agricultural region. As of the 2010 census, the borough population was 18,682. 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 HarrisburgCarlisle 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 Military Heritage Museum. Carlisle also hosts Dickinson College and Penn State Dickinson School of Law. Ahold's U.S. headquarters are in Carlisle.