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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.
Cities in this county include: Northeast Jefferson, Lakewood, Arvada, Broomfield, Wheat Ridge, Dakota Ridge, Ken Caryl, Columbine, Central Jefferson, South Jefferson.