Kennett Square is a borough in Chester County, Pennsylvania, United States.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. The town was originally called 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 theUnderground Railroad that helped slaves escaping to the North for freedom. Many of its prominent citizens helped slaves escape on the Underground Railroad. In 1853, a group asked for Kennett Square to be incorporated, and by 1855 it held elections.Kennett Square's founder is credited with introducing mushroom growing to the area. He grew carnations, a popular local commodity around 1885, and wanted to make use of the wasted space under the elevated beds. He imported spawn from Europe and started experimenting with mushroom cultivation.Kennett Square is the subject and setting of the novel The Story Of Kennett, written by 19th-century American author Bayard Taylor, who lived nearby at Cedarcroft.