East Windsor Township is a township in Mercer County, New Jersey, United States. The township is part of the New York Metropolitan area as defined by the United States Census Bureau, but directly borders the Philadelphia metropolitan area and is part of the Federal Communications Commission's Philadelphia Designated Market Area. As of the 2010 United States Census, the township's population was 27,190, reflecting an increase of 2,271 (+9.1%) from the 24,919 counted in the 2000 Census, which had in turn increased by 2,566 (+11.5%) from the 22,353 counted in the 1990 Census.