Rupert 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. 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 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.