Saddle River is a Borough in Bergen County, New Jersey, United States. As of the United States 2000 Census, the borough population was 3,201. Saddle River has the second-highest per-capita income in the state. Nationwide, Saddle River ranks 28th among the 100 highest-income places in the United States (with at least 1,000 households). Saddle River was incorporated as a borough by an Act of the New Jersey Legislature on November 22, 1894, from portions of Orvil Township, based on the results of a referendum held three days earlier, at the height of the Boroughitis phenomenon sweeping through Bergen County at the time. The borough is named after the Saddle River, which flows through the borough and is a tributary of the Passaic River.