 Established as a center for local farmers in the 18th century, it was transformed in the early 20th century into a center for suburban and summer estate residents.The district was listed on the National Register of Historic Places in 1996.The Round Hill area began as a "backcountry" farming region of Greenwich, populated by English settlers who moved inland from its coastal areas, and by Dutch settlers from New Amsterdam and the Province of New York, both of which contested control of the area through the late 17th century.