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The county was named after the power plant at American Falls and American Falls became the county seat. Power County is bordered on the north by Bingham County, on the south by Oneida County, on the west by Blaine and Cassia Counties and on the east by Bannock County. It encompasses 1,403 square miles and presently has about 7500 residents. Although it is smaller than many of Idaho's other 43 counties, it is larger than the state of Rhode Island, which encompasses only 1,214 square miles.
Power County contains a major river (the Snake), a large reservoir (at American Falls). three mountain ranges (the Bannock and Sublett Ranges and the Deep Creek Mountains), an Indian Reservation (Fort Hall), and a National Forest (Minidoka). The County is primarily agricultural, but has a phosphate plant, a power plant, a potato processing plant, and a coal gasification plant.
Points of interest in Power County include Indian Springs, Crystal Ice Caves, Massacre Rocks State Park, Great Rift National Landmark, The American Falls Reservoir and Dam, and the Power County Historical Museum in American Falls.