Canyon County, Idaho

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Canyon County is a county located in the U.S. state of Idaho. As of the 2000 Census the county had a population of 131,441 (2007 estimate: 179,381).[1] The county seat is Caldwell,[2] and its largest city is Nampa.[citation needed]. Canyon County is part of the Boise City–Nampa, Idaho Metropolitan Statistical Area.



The county was established on March 7, 1891, with its county seat at Caldwell. Current sources attribute the name to the canyon of the Boise River near Caldwell. However, both John Rees and Vardis Fisher believed it was named for the Snake River canyon which forms a natural boundary for the county with Owyhee County. The Hudson's Bay Company established Fort Boise in 1834 near what is now Parma, but abandoned it in 1855. Emigrants traveled through Canyon County on the Oregon Trail.[3] The Oregon Short Line Railroad was completed in 1883.


According to the United States Census Bureau, the county has a total area of 604 square miles (1,560 km2), of which 590 square miles (1,500 km2) is land and 14 square miles (36 km2) (2.28%) is water.

Adjacent counties

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