Officially, the Westchester County Department of Planning divides the county into North, Central and South geographical sub-regions. Municipalities in Westchester are often referenced in connection to the geographical half of the county they are in; either northern or southern.
Municipalities in Southern Westchester
In New York State, there are three types of political subdivisions (i.e. municipalities) of counties: cities, towns, and villages. While cities are incorporated entities, towns are not. However, areas within a town can incorporate; when this occurs, the said area is called a "village". Villages have their own additional level of government along with the government of the town the village lies within. Sometimes a town contains a village with the same name; this village usually contains the town's center.
Furthermore, certain areas of the incorporated (non-village) part of a town often develop their own identity, based around perhaps a school district or zip code; this unofficial formation is known as a hamlet and may or may not be acknowledged by the United States Census for statistical purposes. No matter how closely its residents may identify with their hamlet, a hamlet is not technically a town and has no political meaning. Rather, it could be described as a "mock village". A hamlet can incorporate into a village if a charter is drawn up and the state government approves.
- Dobbs Ferry
- Mamaroneck Town
- Mamaroneck Village
- Mount Vernon
- New Rochelle
- Pelham Town
- Pelham Village
- Pelham Manor
- Port Chester
- Rye Town
- Rye Brook
- Rye City
- White Plains
The Bronx was part of Westchester County until the late 19th century (the West Bronx being given to New York County in 1874 and East Bronx given to it in 1895); as such, it was considered "Southern Westchester" for much of its history.
- Kenneth Chenault, CEO of American Express (New Rochelle) 
- M. Farooq Kathwari, chairman & owner of Ethan Allen (New Rochelle) 
- Ang Lee, Oscar-winning director (Larchmont)
- Thorne, Kathryn Ford, Compiler & Long, John H., Editor (1993). New York Atlas of Historical County Boundaries. Simon & Schuster. pp. 33,118–133. ISBN 0-13-051962-6.
- New York. Laws of New York. 1873, 96th Session, Chapter 613, Section 1. p.928.
- Articles on "consolidation" (by David C. Hammack) and the "Bronx" (by David C. Hermalyn and Lloyd Ultan) in The Encyclopedia of New York City, Yale 1995
- New York. Laws of New York. 1895, 118th Session, Chapter 934, Section 1. p.1948.
- Peck, Richard. "In the Bronx, the Gentry Live On; The Gentry Live On", The New York Times, December 2, 1973. Accessed July 17, 2008. "But the Harlem riverfront was industrializing, and in 1874 the city annexed the area west of the Bronx River: Morrisania, West Farms and Kingsbridge. A second annexation in 1894 gathered in Westchester and portions of Eastchester and Pelham." However, 1894 must refer to the referendum, since the enabling act was not passed or signed until 1895.
- A CEO and a gentleman by Greg Farrell, USA TODAY, April 24, 2005