Jefferson County photograph

Jefferson County

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Area2005
Largest city Lakewood
Population574,613 (2017)
Points of interestRed Rocks Amphitheatre
Date of Reg.
Date of Upd.
ID910206
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About Jefferson County


Jefferson County, sometimes nicknamed JeffCo is one of the 64 counties in the U. S. state of Colorado. As of the 2010 census, the population was 534,543, making it the fourth-most populous county in Colorado. The county seat is Golden, and the most populous city is Lakewood.

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