Welcome to Colusa County ...Time Zone: Colusa County lies in the Pacific Time Zone (PST/PDT) and observes daylight saving time. The community of Colusa is the Seat for Colusa County. Colusa County is one of the original counties of California and was founded in 1850. From the Census Estimates for 2019, <1> Colusa had a population of 21,547 people. This is an increase of 0.51% since the last Census (which gave a population of 21,437 people in 2010). At the time of the 2010 Census, Colusa represented 0.06% of the total population of California. Websites of Interest ...
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