Christiansburg is located at 37°7'46" North, 80°24'32" West (37.129722, -80.408889).
According to the United States Census Bureau, the town has a total area of 13.94 mi2 (36.10 km2). 13.92 mi2 (36.07 km2) of it is land and 0.01 mi2 (0.04 km2) of it is covered by water. The total area is 0.11% water.
Christiansburg is located in the Eastern Standard Time (EST) timezone, GMT-05:00. It observes Daylight Saving Time (DST).