Camden County is a county located in the U.S. state of New Jersey. Its county seat is Camden. As of 2014, Camden County's Census-estimated population was 511,038, a decrease of 0.5% from the 2010 United States Census, when its population was enumerated at 513,657, in turn having increased by 4,725 (up 0.9%, the third-lowest growth rate in the state) from the 508,932 counted in the 2000 Census and retaining its position as the state's eighth-most populous county.