Dayton is located at 39°14'12" North, 119°35'30" West (39.236944, -119.591667).
According to the United States Census Bureau, the city has a total area of 31.73 mi2 (82.19 km2). 31.71 mi2 (82.13 km2) of it is land and 0.02 mi2 (0.06 km2) of it is covered by water. The total area is 0.07% water.
Dayton is located in the Pacific Standard Time (PST) timezone, GMT-08:00. It observes Daylight Saving Time (DST).