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Jefferson County, CO
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Jefferson County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 582,910, making it the fourth-most populous county in Colorado. The county seat is Golden, and the most populous city is Lakewood.
Country:
United States
State:
Colorado
Founded:
November 1, 1861
Named for:
Jefferson Territory
Seat:
Golden
Largest city:
Lakewood
Congressional districts:
1st, 2nd, 6th, 7th
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Data from:
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