|Jefferson County Colorado Cities/Towns - Arvada, Columbine, Evergreen, Golden (County Seat), Lakewood, Pine, Westminster, Wheat Ridge
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Jefferson County is a county in the State of Colorado of the United States. The United States Census Bureau estimates that the county population was 571,837 in 2016. The county seat is Golden.
Jefferson County was named for the namesake of the Jefferson Territory, Thomas Jefferson, the principal author of the Declaration of Independence and the nation's third president.