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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.
Homefacts City Report. Arvada is located in Jefferson County, CO. The population is 109,315, making Arvada the 2nd largest city in Jefferson County and the 7th largest city in the state of Colorado.