Rockleigh is a borough in northeastern Bergen County, in the U.S. state of New Jersey. As of the 2020 United States census, the borough's population was 407, a decrease of 124 (−23.4%) from the 2010 census count of 531, which in turn reflected an increase of 140 (+35.8%) from the 391 counted in the 2000 census. Bordering Alpine, a community ranked America's most expensive ZIP Code by Forbes, Rockleigh has a similar residential character, with large single-family homes on large plots of land.

Alpine is a borough in Bergen County, in the U.S. state of New Jersey, approximately 15 miles (24 km) north of Midtown Manhattan. It is the easternmost community in New Jersey.