The name "Cortlandt Manor" derives from the history of Westchester County.

Until 1991, this area shared a mailing address and ZIP Code (10566) with the city of Peekskill.

The 10567 ZIP code was created by the US Postal Service to differentiate this part of the Town of Cortlandt from Cortland, New York, which is located hours away in upstate New York.

The Upper Manor House was part of the estate of Stephanus Van Cortlandt, the colonial aristocrat and patroon who owned nearly all of northern Westchester County in the late 17th century.

The more familiar centerpiece of the old estate, Van Cortlandt Manor, is located in the nearby village of Croton-on-Hudson.