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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.
ZIP Code: City: County: Type: Area Codes: ZIP Code 80001: Arvada: Jefferson: P.O. Box: 303 / 720: ZIP Code 80002: Arvada: Jefferson: Standard: 303 / 720: ZIP Code 80003: Arvada: Jefferson: Standard: 303 / 720: ZIP Code 80004: Arvada: Jefferson: Standard: 303 / 720: ZIP Code 80005: Arvada: Jefferson: Standard: 303 / 720: ZIP Code 80006: Arvada: Jefferson: P.O. Box: 303 / 720: ZIP Code 80007: Arvada: Jefferson: Standard: 303 / 720