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County Government. Arvada is located primarily in Jefferson County, Colorado. Jefferson County is the largest county in Colorado with a population estimated at 535,000. General boundaries for the county are W. 120th Ave. on the north, Sheridan Blvd. on the east, and Pike National Forest to the south.
Colorado borders Arizona, Kansas, Nebraska, New Mexico, Oklahoma, Utah and Wyoming. Coloradoâs 10 largest cities are Denver, Colorado Springs, Aurora, Fort Collins, Lakewood, Thornton, Westminster, Arvada, Pueblo and Centennial. Learn more about Historical Facts of Colorado Counties. Interactive Map of Colorado County Formation History.