Yardville-Groveville was an unincorporated community and former census-designated place located within Hamilton Township, in Mercer County, in the U.S. state of New Jersey. As of the 2000 United States Census, the CDP's population was 9,208. Since the 2010 census, the area has been split into two, Yardville and Groveville. According to the United States Census Bureau, the CDP had a total area of 9.0 km2. 8.9 km2 of land and 0.1 km2 of water.