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Jefferson County Colorado ☎ +1 303-279-6511 Last Updated: 09/27/2026 |
| Jefferson County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 582,910. The county seat is Golden, and the most populous city is Lakewood. Jefferson County is known for being a beautiful place to live, work, and play. The county is home to mountains, plains, and foothills that line the eastern edge of the Rocky Mountains. | |
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