Chattanooga is located at 35°2'43" North, 85°18'34" West (35.045278, -85.309722).
According to the United States Census Bureau, the city has a total area of 143.17 mi2 (370.80 km2). 135.21 mi2 (350.19 km2) of it is land and 7.96 mi2 (20.61 km2) of it is covered by water. The total area is 5.56% water.
Chattanooga is located in the Eastern Standard Time (EST) timezone, GMT-05:00. It observes Daylight Saving Time (DST).