Millwood is a hamlet located in the town of New Castle, New York in Westchester County. It was originally settled as Sarlesville. The area now known as Millwood appears on 19th century maps as Merritt's Corners (now the intersection of NY 100 and NY 120) and Rockdale Mills (close to what is now the Briarcliff Manor border). As of the 2000 census, the community had a population of 1,210.
Miss America 1984 beauty pageant, model, actress and singer Vanessa Williams grew up in Millwood, but currently lives in New Castle's other hamlet of Chappaqua.
Sarles' Tavern, also known as Granite House, was added to the National Register of Historic Places in 1979.
Most of Millwood lies in the Chappaqua Central School district. Schools include: Elementary - Roaring Brook, Westorchard and Douglas Grafflin; Middle School - Seven Bridges and Robert E. Bell; High School - Horace Greeley. Most Millwood public school students will go to Westorchard, Seven Bridges, and Horace Greeley. The last group of students who graduated from Bell are seniors during the 2007-2008 school year. Over 94% of Greeley graduates attend 4-year colleges.
Millwood had a train station that was originally built by the New York and Putnam Railroad, that later became the Putnam Division of the New York Central Railroad. The last passenger train ran along the Putnam Division in May 1958. Freight service ended in 1962, when the rails were removed after this section had been abandoned. [There was no usable track already by 1970.] Pavement has since taken its place, and it is now a bicycle and pedestrian path, the North County Trailway. The original Millwood station house, built in 1888, burnt to the ground soon after the station was built, and it was replaced by a baggage car. The baggage car remained the station until 1910, when Henry Law built a new station for Briarcliff and the old Briarcliff Manor station was moved to Millwood. This station house was demolished in May 2012.