Naperville is located at 41°47'8" North, 88°8'49" West (41.785556, -88.147222).
According to the United States Census Bureau, the city has a total area of 35.52 mi2 (92.00 km2). 35.38 mi2 (91.63 km2) of it is land and 0.14 mi2 (0.38 km2) of it is covered by water. The total area is 0.41% water.
Naperville is located in the Central Standard Time (CST) timezone, GMT-06:00. It observes Daylight Saving Time (DST).