Saddle River is a borough in Bergen County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 3,152, reflecting a decline of 49 (-1.5%) from the 3,201 counted in the 2000 Census, which had in turn increased by 251 (+8.5%) from the 2,950 counted in the 1990 Census.
Saddle River is one of the wealthiest small municipalities in the United States and ranked 9th in New Jersey in per capita income as of the 2010 Census. Based on 1989 per capita income, Saddle River was ranked the richest suburb in the nation among those with 2,500 or more people. The borough ranked 28th as of the 2000 Census 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. The borough was formed during the "Boroughitis" phenomenon then sweeping through Bergen County, in which 26 boroughs were formed in the county in 1894 alone. Saddle River's referendum passed on November 19, one day before the referendum passed for the formation of the neighboring borough of Upper Saddle River.
Despite being fairly close to Manhattan, a bucolic atmosphere pervades in town, due in part to a minimum zoning requirement of for homes. The borough contains both newer mansions and stately older homes on vast tracts of land, many of the properties contain horses. It is a dry town, where alcohol cannot be sold.