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Home >> State of Washington >> Cowlitz County  

Welcome to Cowlitz County ...

Time Zone: Cowlitz County lies in the Pacific Time Zone (PST/PDT) and observes daylight saving time.

The community of Kelso is the Seat for Cowlitz County.

Cowlitz County is one of the original counties of Washington and was founded in 1854.

From the Census Estimates for 2019, <1> Cowlitz had a population of 110,593 people. This is an increase of 8.05% since the last Census (which gave a population of 102,358 people in 2010).

At the time of the 2010 Census, Cowlitz represented 1.52% of the total population of Washington.

Below are some of the communities located in Cowlitz County:

  • Castle Rock
    (10 miles [16.1 km] to the northwest)
  • Kalama
    (12 miles [19.3 km] to the south)
    • Jump to our Gazetteer entry for Kalama
    • Kalama is located in Cowlitz County (WA)
    • Population from the 2020 Census: 2,844 people
    • Jump to TripAdvisor's Tourism page for Kalama <2>
  • Kelso
    (7 miles [11.3 km] to the west)
    • Jump to our Gazetteer entry for Kelso
    • Kelso is located in Cowlitz County (WA)
    • Population from the 2020 Census: 12,438 people
    • Jump to TripAdvisor's Tourism page for Kelso <2>
  • Longview
    (9 miles [14.5 km] to the west)
    • Jump to our Gazetteer entry for Longview
    • Longview is located in Cowlitz County (WA)
    • Population from the 2020 Census: 38,515 people
    • Jump to TripAdvisor's Tourism page for Longview <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.
 

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This page was last modified/updated: 22 Mar 2025