Rexburg is a city in Madison County, Idaho, and the population was 25,484 at the 2010 census, up from 17,257 in 2000. The city is the county seat of Madison County and its largest city. The city takes its name from Ricks, the German form of which is “Rex”, after founder Thomas Edwin Ricks. The city was incorporated in 1883. Rexburg is the principal city of the Rexburg, ID Micropolitan Statistical Area, which includes Fremont and Madison Counties. According to the United States Census Bureau, the city has a total area of 9.84 square miles, of which, 9.76 square miles is land and 0.08 square miles is water.