Madison is located at 43°4'22" North, 89°24'2" West (43.072778, -89.400833).
According to the United States Census Bureau, the city has a total area of 84.68 mi2 (219.31 km2). 68.67 mi2 (177.86 km2) of it is land and 16.01 mi2 (41.45 km2) of it is covered by water. The total area is 18.90% water.
Madison is located in the Central Standard Time (CST) timezone, GMT-06:00. It observes Daylight Saving Time (DST).