The City of Thornton is a Home Rule Municipality in Adams and Weld counties in the U.S. state of Colorado and a suburb of the Denver-Aurora-Broomfield, CO Metropolitan Statistical Area. Thornton is northeast of the state's capital, Denver. The United States Census Bureau estimates that the city population was 117,003 on July 1, 2009, a 37.68% increase from the 2000 Census population of 82,384. Thornton is the sixth most populous city in the State of Colorado and the 221st most populous city in the United States.

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