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- WELCOME TO Onida, South Dakota Onida, South Dakota is a community of 800 people located in the central plains region of Sully County, South Dakota. We are a progressive agricultural community with the recreational benefits of the Missouri River only 25 miles away. We invite you to visit our town of Onida through this page and better yet visit us on US Highway 83, 30 miles north of Pierre, for ...www.onida.org