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is a city in and the county seat of Canyon County, Idaho, United States. The U.S. Census Bureau estimated the population to be 39,889, as of July 1, 2007.
Caldwell is the home of the College of Idaho. It is considered part of the Boise metropolitan area.
According to the United States Census Bureau, the city has a total area of 11.4 sq mi, of which 11.3 sq mi is land and 0.09% is water.