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Marsing and Owyhee County History
On December 31, 1863, Owyhee became the first county created by the newly-formed Idaho territorial legislature. Its extent was defined as “that terri-tory lying south of the Snake River and west of the summit of the Rocky Mountains.” By 1879, it was reduced to its present size, bordered by Nevada on the south, Oregon on the west, Twin Falls County on the east, and the Snake River on the north.
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