Millville is a city in Cumberland County, New Jersey, United States. As of the United States 2000 Census, the city population was 26,847. Millville, Bridgeton and Vineland are the three principal New Jersey cities of the Vineland-Millville-Bridgeton Primary Metropolitan Statistical Area which encompasses those cities and all of Cumberland County for statistical purposes. Millville was originally incorporated as a township by an Act of the New Jersey Legislature on February 24, 1801, from portions of Fairfield Township. Portions of the township were taken to form Landis Township on March 7, 1864. Millville was reincorporated as a city on March 1, 1866, based on the results of a referendum passed that same day.