- Welcome to the Rockland County, New York GenWeb and American Local History Network History and geography Rockland County was formed on 23 Feb 1798 from Orange County. It is across the Hudson River from Westchester County , and is only about 25 miles northwest of New York City. It is on the New Jersey state line, next to Bergen County, NJ. Rockland County Links Links to Rockland maps, ...www.rootsweb.com/~nyrockla