Walden is the largest of three villages of the Town of Montgomery in Orange County, New York, United States. The population was 6,978 at the 2010 census. It has the ZIP Code 12586 and the 778 telephone exchange within the 845 area code. Walden is part of the Poughkeepsie−Newburgh−Middletown, NY Metropolitan Statistical Area as well as the larger New York−Newark−Bridgeport, NY-NJ-CT-PA Combined Statistical Area.The village began in the early 18th century as a mill town along the Wallkill River. One miller, Jacob Walden, was so successful the village that incorporated in the mid-19th century took its name from him. Later, it would be the village's three knife manufacturers that brought it growth and prosperity. They are gone today, but other industrial concerns remain. Walden has been best known in the Hudson Valley as the home of the Thruway Markets hypermarket complex, which closed in 2013.