City of St. Charles, South Dakota

St. Charles is located at 43°5'14" North, 99°5'46" West (43.087419, -99.096140).

According to the United States Census Bureau, the city has a total area of 0.19 mi² (0.50 km²). 0.19 mi² (0.50 km²) of it is land and none of the area is covered by water.

St. Charles is located in the Central Standard Time (CST) timezone, GMT-06:00. It observes Daylight Saving Time (DST).