Otter Lake is located at 43°12'47" North, 83°27'15" West (43.213056, -83.454444).
According to the United States Census Bureau, the village has a total area of 0.76 mi2 (1.98 km2). 0.68 mi2 (1.76 km2) of it is land and 0.08 mi2 (0.22 km2) of it is covered by water. The total area is 10.99% water.
Otter Lake is located in the Eastern Standard Time (EST) timezone, GMT-05:00. It observes Daylight Saving Time (DST).