Google can sometimes be your friend. In this case, Google Maps. Apparently Kumdo is the Korean equivalent to Kendo, so try Brookings.
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You are correct, Kumdo is 99% the same as Kendo.
I would recommend checking out Next Edge Kumdo in Sioux Falls, I believe it's currently located at X-Fitness on Minnesota Ave. From what I hear the instructor's pretty darn good and they have a decent sized group you can practice with.
you might not find an actual dojo but you could look for people on craigslist in your area who can teach kendo and see if they would take you
Google says that there hasn't been one in SD since 2008, when the one in Rapid City closed.