The Town of Hadley is located in the northeastern corner of Saratoga County and covers 32 square miles. The Town is separate from Lake Luzerne in Warren County by the Hudson River and other bordering towns are Stony Creek to the North, Corinth to the South and Day to the West. The land is hilly with light sandy soil and boulders with the Kayaderossera Mountains forming the gateway to the Adirondack Park.

Lands taken from the Town of Greenfield and the Town of Northumberland formed the Town of Hadley on February 27, 1801. On April 20, 1818 the southern portion became the Town of Corinth and in 1819, some of the western portion was added to the Town of Day, thus reducing the Town of Hadley to its present dimensions.

In addition to a few small creeks such as Wolf Creek, are the Sacandaga and Hudson Rivers which meet to form Phelps Bay between the Hadley hamlet area and Lake Luzerne. Earlier, the bay had been called Ti-o-sa-ron-da, "meeting of the waters" by the Indians. Palmer's Falls also known as Hadley Falls was called Kah-che-bon-cook by the Indians.