Since Alplaus is not an incorporated area, its borders are not specific. Some consider the
ZIP Code 12008 to define Alplaus, while others may say it is the Alplaus volunteer fire department (officially known as Glenville Fire District #2). Alplaus is located at . It has an elevation of approximately at the
Mohawk River.
Rexford, a hamlet in the town of
Clifton Park in
Saratoga County, borders Alplaus to the east. The Mohawk River borders on the south. Generally, the Glenridge and Schenectady County Airport represents the western border. The major natural feature of the hamlet is the Alplaus
Kill (creek), which is a tributary to the Mohawk River. There is one main road (Alplaus Avenue), with several streets branching from it. On this road in the center of the hamlet are two important community facilities: the
post office and the
fire station. == Airports ==