Welcome to Oglala Lakota County ...Time Zone: Oglala Lakota County lies in the Mountain Time Zone (MST/MDT) and observes daylight saving time. Oglala Lakota County was founded in 1875 and was created by taking area from Fall River County. From the Census Estimates for 2019, <1> Oglala Lakota had a population of 14,177 people. This is an increase of 3.97% since the last Census (which gave a population of 13,636 people in 2010). At the time of the 2010 Census, Oglala Lakota represented 1.67% of the total population of South Dakota. Websites of Interest ...
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