Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Chappaqua is a hamlet and census-designated place in northern Westchester County, New York. As of the 2000 census, the population was 11,009. Chappaqua is located in the Town of New Castle. In the early 1730s a group of Quakers moved north from Purchase, New York, to settle in present-day Chappaqua. They built their homes on Quaker Street and held their meetings at the home of Abel Weeks. Their meeting house was built in 1753 and still holds weekly meetings each Sunday. The area around the meeting house, known as Old Chappaqua Historic District, was added to the National Register of Historic Places in 1974.