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Jefferson County has a history rich in people, events and progress. Explore the park and recreation districts, arts and music, museums and attractions that Jefferson County has to offer.
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The Jefferson County vision is to provide innovative,...
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In Jefferson County, we’re dedicated to ensuring everyone...
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Residents - Jefferson County, CO | Official Website
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The Jefferson County EDC concentrates on creating, expanding...
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Jefferson County. Physical Address 100 Jefferson County...
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I Want To - Jefferson County, CO | Official Website
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Stay Connected - Jefferson County, CO | Official Website
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As a current Jefferson County employee (full-time,...
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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's Lakewood. Jefferson County is included in the Denver-Aurora-Lakewood, CO Metropolitan Statistical Area.
Jefferson County, commonly referred to as “Jeffco,” is named after former president Thomas Jefferson and covers 774 square miles in central Colorado west of Denver.
The county, formally organized in 1861 by the Colorado Territorial Legislature, takes the name of Thomas Jefferson, the third president of the United States. Jefferson County is a place where the great plains meet the Rocky Mountains with some of the most magnificent scenery in the country.
303-271-6511. 100 Jefferson County Parkway Golden, CO 80419 United States. Alerts. Emergency Response Guide; Emergency Management
The 2020 U.S. Census Bureau data shows the Resident Population of the United States as of April 1, 2020, was 331,449,281. This represents a 7.4% increase from 2010. Colorado (5,773,714) showed a 14.8% population increase from 2010 and gained a seat in the House of Representatives.
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In 2022, Jefferson County, CO had a population of 581k people with a median age of 40.2 and a median household income of $103,167. Between 2021 and 2022 the population of Jefferson County, CO grew from 580,130 to 580,519, a 0.0671% increase and its median household income grew from $93,933 to $103,167, a 9.83% increase.