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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.
Jefferson County is a county located in the U.S. state of Idaho. As of the 2010 census, the population was 26,140. The county seat and largest city is Rigby. The county was established in 1913 and named after Thomas Jefferson, the third U.S. President. Jefferson County is part of the Idaho Falls, ID Metropolitan Statistical Area.