• The Community of Jefferson County


    Once an agricultural and mining area, Jefferson County, Colorado is a thriving suburban, business, industrial, recreational and residential community. The county, formally organized in 1861 by the Colorado Territorial Legislature, takes the name of Thomas Jefferson, the third president of the United States.

    Life in Jeffco

    Learn more about the thriving suburban, business, industrial, recreation and residential community that is Jefferson County.

    County News

    See all the latest news from all areas of the county.

    County Events

    See all the latest events from all areas of the county.

    Community Calendar

    Events and happenings from all around the county for the benefit of Jefferson County residents and visitors.


    Jefferson County has a first-class public school sysem and at least a dozen institutions of higher education.


    Jefferson County has a history rich in people, events and progress. See the general history as well as that from our sesquicentennial.


    Maps and directions for Jeffco.

    Slash Collection

    See the details on slash locations and dates, fees and what is and is not accepted.

    Stay Connected

    See the complete list of Jefferson County social media site, newsletters, blogs and more.

    Things to Do in Jeffco

    Explore the park and recreation districts, arts and music, museums and attractions that Jefferson County has to offer.