Alpine is a borough in Bergen County, New Jersey, United States. It is located 15 miles (24 km) north of midtown Manhattan. It is the easternmost community in the state of New Jersey.
As of the 2010 United States Census, the borough's population was 1,849, reflecting a decline of 334 (−15.3%) from the 2,183 counted in the 2000 Census, which had in turn increased by 467 (+27.2%) from the 1,716 counted in the 1990 Census.
In 2012, Forbes ranked Alpine as America's most expensive ZIP Code with a median home price of $4.25 million, after being ranked 4th in the magazine's 2010 listing of "America's Most Expensive ZIP Codes", with a median home price of $3,814,885. In 2009, Forbes ranked Alpine first, along with Greenwich, Connecticut, with a median home price of $4.14 million. Alpine was tied with Greenwich for first in both 2006 and 2007 on the ABC News list of most expensive ZIP Codes, with a median home sale price of $3.4 million. In 2019, PropertyShark ranked Alpine as the 53rd most expensive ZIP Code in the country with a median sales price of $1,785,000, a drop from a ranking of 33rd nationwide in 2018 due to a decline of 19% in sales prices. Based on data from the 2006-2010 American Community Survey, the borough had a per-capita income of $107,604, ranked second in the state.
New Jersey Monthly magazine ranked Alpine as its 15th best place to live in its 2008 rankings of the "Best Places To Live" in New Jersey.
Alpine was formed by an act of the New Jersey Legislature on April 8, 1903, from portions of Harrington Township. The borough acquired a portion of Cresskill in 1904. The borough's name came from the wife of journalist Charles Nordhoff, who found the setting reminiscent of the Swiss Alps.
According to the United States Census Bureau, the borough had a total area of 9.22 square miles (23.89 km2), including 6.40 square miles (16.58 km2) of land and 2.82 square miles (7.31 km2) of water (30.61%).
The borough borders Closter, Cresskill, Demarest, Norwood, Rockleigh and Tenafly in Bergen County.