Germantown is located at 43°13'41" North, 88°6'35" West (43.228333, -88.110000).
According to the United States Census Bureau, the village has a total area of 34.46 mi2 (89.25 km2). 34.42 mi2 (89.15 km2) of it is land and 0.04 mi2 (0.10 km2) of it is covered by water. The total area is 0.11% water.
Germantown is located in the Central Standard Time (CST) timezone, GMT-06:00. It observes Daylight Saving Time (DST).