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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.
The county seat is the city of Reno, the second largest city in Nevada. Other communities in Washoe County are Sparks, Incline Village at Lake Tahoe, and the Pyramid Lake Paiute Reservation.