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In page Benton Township, Benton County, Iowa:

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According to the United States Census Bureau, Benton Township covers an area of 22.57 square miles (58.46 square kilometers); of this, 22.39 square miles (57.99 square kilometers, 99.2 percent) is land and 0.18 square miles (0.47 square kilometers, 0.8 percent) is water.