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Welcome to Jefferson County ...

Time Zone: Jefferson County lies in the Mountain Time Zone (MST/MDT) and observes daylight saving time.

The community of Golden is the Seat for Jefferson County.

Jefferson County is one of the original counties of Colorado and was founded November 1, 1861.

From the Census Estimates for 2019, <1> Jefferson had a population of 582,881 people. This is an increase of 8.84% since the last Census (which gave a population of 535,548 people in 2010).

At the time of the 2010 Census, Jefferson represented 10.65% of the total population of Colorado.

Below are some of the communities located in Jefferson County:

  • Arvada
    (6 miles [9.7 km] to the northeast)
    • Arvada is located in Jefferson County (CO)
    • Jump to our Gazetteer entry for Arvada
    • Population from the 2020 Census: 121,936 people
    • Jump to TripAdvisor's Tourism page for Arvada <2>
  • Edgewater
    (4 miles [6.4 km] to the east)
    • Edgewater is located in Jefferson County (CO)
    • Jump to our Gazetteer entry for Edgewater
    • Population from the 2020 Census: 5,393 people
    • Jump to TripAdvisor's Tourism page for Edgewater <2>
  • Golden
    (4 miles [6.4 km] to the northwest)
    • Golden is located in Jefferson County (CO)
    • Jump to our Gazetteer entry for Golden
    • Population from the 2020 Census: 20,347 people
    • Jump to TripAdvisor's Tourism page for Golden <2>
  • Lakeside
    (5 miles [8 km] to the northeast)
  • Lakewood
    (3 miles [4.8 km] to the east)
    • Lakewood is located in Jefferson County (CO)
    • Jump to our Gazetteer entry for Lakewood
    • Population from the 2020 Census: 157,429 people
    • Jump to TripAdvisor's Tourism page for Lakewood <2>
  • Morrison
    (7 miles [11.3 km] to the southwest)
    • Morrison is located in Jefferson County (CO)
    • Jump to our Gazetteer entry for Morrison
    • Population from the 2020 Census: 430 people
    • Jump to TripAdvisor's Tourism page for Morrison <2>
  • Mountain View
    (5 miles [8 km] to the northeast)
    • Mountain View is located in Jefferson County (CO)
    • Jump to our Gazetteer entry for Mountain View
    • Population from the 2020 Census: 549 people
  • Wheat Ridge
    (4 miles [6.4 km] to the northeast)

Websites of Interest ...

Footnotes ...

<1>On a yearly basis, the US Census Bureau creates an estimate of the county's population. Keep in mind that this is an estimate and not an actual count. The last physical count was the 2010 Census and the next count will be for the 2020 Census.
<2>While we're fans and frequent users of TripAdvisor, you should know that we're also members of the TripAdvisor affiliate program.