Henderson, formerly known as Henderson Island, is an unincorporated community and a U.S. Post Office in Adams County, Colorado, United States. Henderson has the ZIP Code 80640. Portions of …Henderson, formerly known as Henderson Island, is an unincorporated community and a U.S. Post Office in Adams County, Colorado, United States. Henderson has the ZIP Code 80640. Portions of the Henderson area have been annexed by Commerce City, Brighton, and Thornton.
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