Sewanee is located at 35°12'11" North, 85°55'15" West (35.203056, -85.921111).
According to the United States Census Bureau, the city has a total area of 4.65 mi2 (12.03 km2). 4.63 mi2 (11.98 km2) of it is land and 0.02 mi2 (0.05 km2) of it is covered by water. The total area is 0.41% water.
Sewanee is located in the Central Standard Time (CST) timezone, GMT-06:00. It observes Daylight Saving Time (DST).