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is a city in Madison County, Idaho, in the United States. As of the 2000 census, the city population was 17,257. The city is the county seat of Madison County.
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 5.0 square miles (12.8 km²), of which, 4.9 square miles (12.6 km²) of it is land and 0.1 square miles (0.2 km²) of it (1.61%) is water.
Much of Rexburg, including BYU-Idaho and the Rexburg, Idaho LDS Temple, rests atop a shield volcano. Eruptions are not expected in the near future this far south; besides Yellowstone, Island Park is the most likely setting for future volcanic activity in this area. Many different types of volcanoes exist near Rexburg, including cinder cones, spatter Cones, other shield volcanoes, and volcanic fissures. There are lava fields to the west and south of Rexburg, the results of open fissure eruptions from about two thousand years ago. Nearby Craters of the Moon State Park presents the most obvious features of this recent activity. Sediment deposits enriched by volcanism make the surrounding area famous for its production of large starch-rich potatoes.
Rexburg is close to the St. Anthony Sand Dunes, the West Entrance of Yellowstone National Park and the Grand Tetons.