Cumberland County is a county located in the U.S. state of New Jersey. As of the 2010 United States Census, the population was 156,898, increasing by 10,460 (+7.1%) from the 146,438 counted in the 2000 Census, retaining its position as the state's 16th-most populous county. Its county seat is Bridgeton. Cumberland County is named for Prince William, Duke of Cumberland. The county was formally created from portions of Salem County as of January 19, 1748.