Port Chester is a village in the U.S. state of New York and the largest part of the town of Rye in Westchester County by population. At the 2010 U.S. census, the village had a population of 28,967 and was the fifth-most populous village in New York State. In 2019, its population grew to a census-estimated 29,342 residents. Located in southeast Westchester, Port Chester forms part of the New York City metropolitan statistical area. Port Chester borders Connecticut and the town of Greenwich to the east. It is one of only 12 villages in New York still incorporated under a charter; other villages either incorporated or reincorporated under the provisions of Village Law.

The administrative divisions of New York are the various units of government that provide local services in the American state of New York. The state is divided into boroughs, counties, cities, towns, and villages. They are municipal corporations, chartered (created) by the New York State Legislature, as under the New York State Constitution the only body that can create governmental units is the state. All of them have their own governments, sometimes with no paid employees, that provide local services. Centers of population that are not incorporated and have no government or local services are designated hamlets. Whether a municipality is defined as a borough, city, town, or village is determined not by population or land area, but rather on the form of government selected by the residents and approved by the New York State Legislature. Each type of local government is granted specific home rule powers by the New York State Constitution. There are still occasional changes as a village becomes a city, or a village dissolves, each of which requires legislative action. New York also has various corporate entities that provide local services and have their own administrative structures (governments), such as school and fire districts. These are not found in all counties.