Eastchester is a town in southern Westchester County, New York, United States. The population was over 34,641 at the 2020 United States census over 32,363 at the 2010 census. There are two villages within the town: Bronxville and Tuckahoe. The town contains a census-designated place also named Eastchester, which is the whole town of Eastchester excluding Bronxville and Tuckahoe.

Bronxville is a village in Westchester County, New York, United States, located approximately 15 miles (24 km) north of Midtown Manhattan. It is part of the town of Eastchester. The village comprises one square mile (2.5 km2) of land in its entirety, approximately 20% of the town of Eastchester. As of the 2020 U.S. census, Bronxville had a population of 6,656. In 2016, Bronxville was rated by CNBC as the most expensive suburb of any of the U.S. ten largest cities, with a median home value of $2.33 million. It was ranked eighth in Bloomberg's "America's 100 Richest Places" in 2017 and 2018 and ninth in 2019 and is the second-richest town in the state of New York behind Scarsdale.