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is the county seat and largest city of Minidoka County, Idaho, United States. It is part of the Burley, Idaho Micropolitan Statistical Area. The population was 5,645 at the 2000 census.
Rupert sprung up after the announcement of the Minidoka Reclamation Project, which would provide irrigation and electricity to the area by the building of the Minidoka Dam.
Electricity was plentiful in Rupert after the building of the Minidoka Dam and led to Rupert being one of the first cities in the world to have its streets lighted by electricity. Rupert was founded in 1906.
Rupert is located at (42.617967, -113.674543), at 4,150 feet in elevation. It is part of the agricultural region of the Snake River Plain known as Magic Valley, and is a few miles north of the Snake River. Interstate 84 passes a few miles to the south, and before its construction, U.S. Highway 30 passed through Rupert. Acequia lies about 5 miles northeast of Rupert and Paul lies about 5 miles to the west.
According to the United States Census Bureau, the city has a total area of 2.0 square miles (5.3 km²), all of it land.