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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.
Interstate 76 (I-76) is an Interstate Highway that runs from Interstate 70 in Arvada, Colorado (near Denver) to an intersection with Interstate 80 near Big Springs, Nebraska. The vast majority of the road's route is in Colorado.