[3] The county's name is in honor of the American Revolutionary War general Nathanael Greene.

This transferred Prattsville, Vly Mountain, Halcott Center, Bushnellsville, Highmount, Shandaken, Lanesville, and Pine Hill within Greene County.

[7] On April 15, 1814, the county borders were re-surveyed, and the line adjusted with no change in area.

[8] On April 17, 1822, the border was again surveyed, with no change in area, but Palenville was found to be inside Greene County.

[10] On March 3, 1836, 30 square miles (78 km2) of area was lost to Schoharie County, reducing the total area to 660 square miles (1,700 km2), and reassigning Manorkill, producing the Greene County that exists today.

[12] Greene County is located in southeast central New York State, just west of the Hudson River and south of Albany.

For example, the highest elevation is Hunter Mountain, at approximately 4,040 feet (1,230 m) above sea level; In addition, there are many picturesque waterfalls in the park such as the famed, Kaaterskill Falls.

The entirety of Greene County is in the 19th Congressional District, and is represented by Democrat Josh Riley.

It was one of only eleven counties in New York that did not vote for Bill Clinton in 1996, a strong year for Democrats.

It supported John McCain by a margin just under ten points in 2008 over Barack Obama, another Democratic year.