[3] Windham Township is located in northeast Bradford County, along the New York state line.

To the north, in Tioga County, New York, is the town of Nichols.

Wappasening Creek flows through the northeast part of the township into New York state, where it joins the Susquehanna River.

There were 440 housing units at an average density of 13.7 per square mile (5.3/km2).

27.7% of all households were made up of individuals, and 13.4% had someone living alone who was 65 years of age or older.