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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.
Aurora, to the east is very large but rather featureless, as is Lakewood to the west. The other more attractive suburbs lie to the northwest towards Boulder â Arvada, Westminster, Lafayette, and Louisville. The latter two are in Boulder County and actually covered under Boulder. These suburbs are self-contained towns with a strong country feel and plenty of local employment.