Oradell is a borough in Bergen County, New Jersey, United States. At the United States 2000 Census, the borough population was 8,047. The borough's territory includes a dam on the Hackensack River that forms the Oradell Reservoir. Oradell was originally formed on March 8, 1894, as the Borough of Delford, from portions of Harrington Township, Midland Township and Palisades Township, at the height of the Boroughitis phenomenon then sweeping through Bergen County. The name Delford was a portmanteau created from the names of two communities within the new borough: Oradell and New Milford. On November 12, 1920, the borough's name was officially changed to "Oradell", based on the results of a referendum held ten days earlier.