Arvada is a home rule city located in Jefferson and Adams counties, Colorado, United States. The city population was 124,402 at the 2020 United States census, with 121,510 residing in Jefferson County
Adams County is a county located in the U.S. state of Colorado. As of the 2020 United States census, the population was 519,572. The county seat is Brighton, and the largest city is Thornton. The coun