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is a Township in Mercer County, New Jersey, United States. As of the United States 2000 Census, the township population was 24,919, which had grown to an estimated 26,686 as of 2007.
East Windsor Township was formed when Windsor Township was split on February 9, 1797, with West Windsor Township formed at the same time, all while the area was still part of Middlesex County. It was incorporated as one of New Jersey's initial group of 104 townships by an Act of the New Jersey Legislature on February 21, 1798. Portions of the township were taken to form Hightstown borough (March 5, 1853, within East Windsor; became independent c. 1894) and Robbinsville Township (March 11, 1860, and known as Washington Township until 2007).
According to the United States Census Bureau, the township has a total area of 15.7 square miles (40.7 km²), of which, 15.6 square miles (40.5 km²) of it is land and 0.1 square miles (0.1 km²) of it (0.32%) is water.
East Windsor Township borders the Township of West Windsor and Robbinsville Township in Mercer County, the Township of Plainsboro, the Township of Cranbury and Monroe Township in Middlesex County, Upper Freehold Township and Millstone Township in Monmouth County.
Hightstown Borough is an independent municipality surrounded by East Windsor Township.
Twin Rivers (2000 Census population of 7,422) is a census-designated place and unincorporated area located within East Windsor Township.