The hamlets of Valhalla, Hawthorne, Pocantico Hills, and Thornwood, and the villages of Pleasantville, Sleepy Hollow, and a small portion of Briarcliff Manor lie within the town.

[3] Mount Pleasant is located about 27 miles north of Manhattan.

There were 13,985 housing units at an average density of 504.9 per square mile (194.9/km2).

In April 2017, Westchester County officials unveiled plans for a 3-million-square-foot biotechnology hub to be built with US$1.2 billion in private investment on vacant land adjacent to Westchester Medical Center in Valhalla.

The bioscience center, a public-private partnership, is anticipated to create 12,000 new jobs and include over 2.25 million square feet of biotechnology research space.