The City of Thornton is a home rule municipality located in Adams and Weld counties, Colorado, United States. Thornton is the sixth most populous city in Colorado with a population of 141,867 and was incorporated in 1956.
The City of Thornton is a home rule municipality located in Adams and Weld counties, Colorado, United States. Thornton is the sixth most populous city in Colorado with a population of 141,867 and was incorporated in 1956.