Sorry I'm late to the party on this one. Sioux County now has several repeaters, and they are not as high-powered as before from what I can tell.
They still use 151.010 (Orange City)
But they also use:
155.565 Boyden tower
155.865 Rock Valley tower
156.2325 Hawarden tower
I know at least some of the towers use 084 NAC, but I don't think they all do.