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Welcome to Boulder County ...

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

The community of Boulder is the Seat for Boulder County.

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

From the Census Estimates for 2019, <1> Boulder had a population of 326,196 people. This is an increase of 10.56% since the last Census (which gave a population of 295,037 people in 2010).

At the time of the 2010 Census, Boulder represented 5.87% of the total population of Colorado.

Below are some of the communities located in Boulder County:

  • Boulder
    (5 miles [8 km] to the southwest)
    • Boulder is located in Boulder County (CO)
    • Jump to our Gazetteer entry for Boulder
    • Population from the 2020 Census: 107,645 people
    • Jump to TripAdvisor's Tourism page for Boulder <2>
  • Erie
    (8 miles [12.9 km] to the east)
    • Erie is located in Boulder County (CO)
    • Jump to our Gazetteer entry for Erie
    • Population from the 2020 Census: 30,318 people
    • Jump to TripAdvisor's Tourism page for Erie <2>
  • Jamestown
    (10 miles [16.1 km] to the west)
  • Lafayette
    (6 miles [9.7 km] to the southeast)
  • Longmont
    (9 miles [14.5 km] to the northeast)
    • Longmont is located in Boulder County (CO)
    • Jump to our Gazetteer entry for Longmont
    • Population from the 2020 Census: 98,445 people
    • Jump to TripAdvisor's Tourism page for Longmont <2>
  • Louisville
    (6 miles [9.7 km] to the southeast)
  • Lyons
    (12 miles [19.3 km] to the north)
    • Lyons is located in Boulder County (CO)
    • Jump to our Gazetteer entry for Lyons
    • Population from the 2020 Census: 2,058 people
    • Jump to TripAdvisor's Tourism page for Lyons <2>
  • Nederland
    (17 miles [27.4 km] to the west)
    • Nederland is located in Boulder County (CO)
    • Jump to our Gazetteer entry for Nederland
    • Population from the 2020 Census: 1,557 people
    • Former names for Nederland:
    • Browns Crossing
    • Dayton
    • Middle Boulder
    • Jump to TripAdvisor's Tourism page for Nederland <2>
  • Superior
    (8 miles [12.9 km] to the south)
    • Superior is located in Boulder County (CO)
    • Jump to our Gazetteer entry for Superior
    • Population from the 2020 Census: 13,413 people
    • Jump to TripAdvisor's Tourism page for Superior <2>
  • Ward
    (16 miles [25.7 km] to the west)
    • Ward is located in Boulder County (CO)
    • Jump to our Gazetteer entry for Ward
    • Population from the 2020 Census: 168 people
    • Jump to TripAdvisor's Tourism page for Ward <2>

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.