City of St. Augustine, Illinois

St. Augustine is located at 40°43'10" North, 90°24'35" West (40.719523, -90.409832).

According to the United States Census Bureau, the city has a total area of 0.61 mi² (1.59 km²). 0.61 mi² (1.59 km²) of it is land and none of the area is covered by water.

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