The city of Thornton is a home rule municipality located in Colorado. Situated in Weld and Adams counties, and the northeast region of the Denver-Aurora-Broomfield, CO Metropolitan Statistical Area, Thornton is about 10 miles north-northeast of downtown Denver, the most populous city of Colorado.
In 1960, four years after Thornton was incorporated as a city, the population stood at 11,353. The years between 1970 and 1980 saw a huge growth from 13,326 to 42,054, and an annual growth rate of 12.18%. This could be attributed to the annexation of neighboring communities.
As of 2019, the population of Thornton, Colorado stands at 137,000, with a percentage growth of over 1,000% in the 60 years since the city was incorporated in 1956. Colorado is now the 7th fastest-growing state in the U.S. with much of the growth in the Metro Denver area. Since the 1930s, Metro Denver's growth rate has outpaced the national average (http://www.metrodenver.org/do-business/demographics/population/) and this growth has included the area of Thornton.