Welcome to Clay County ...Time Zone: Clay County lies in the Central Time Zone (CST/CDT) and observes daylight saving time. The community of Vermillion is the Seat for Clay County. Clay County was founded in 1862. From the Census Estimates for 2019, <1> Clay had a population of 14,070 people. This is an increase of 1.75% since the last Census (which gave a population of 13,828 people in 2010). At the time of the 2010 Census, Clay represented 1.7% of the total population of South Dakota. Websites of Interest ...
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