Kennett Square is a borough in Chester County, Pennsylvania, United States. It is known as the Mushroom Capital of the World because mushroom farming in the region produces over 500 million pounds of mushrooms a year, totaling half of the United States mushroom crop. To celebrate this heritage, Kennett Square has an annual Mushroom Festival, where the town shuts down to have a parade, tour mushroom farms, and buy and sell food and other goods. It is also home to the corporate headquarters of Genesis HealthCare which administers elderly care facilities. Located in the Delaware Valley, Kennett Square is considered a suburb of both Philadelphia, Pennsylvania and Wilmington, Delaware. The local high school is Kennett High School. Its population was 6,072 at the 2010 census.
The area to become known as Kennett Square was originally inhabited by the Lenape Native Americans. Once colonized, the town was named Kennet Square, with the name "Kennet", England, and "Square" coming from the original land grant from William Penn of one square mile. General Sir William Howe marched through Kennett to the Battle of Brandywine during the American Revolution. It was also known as an important part of the Underground Railroad, which helped slaves escaping to the North for freedom.