Specifically the three dark red (or orange) precincts in the south of the county all go >70% McCain. I also wonder if the rural area next to Saginaw that is unnaturally republican is also dutch
The Republican patch near Saginaw isn't Dutch, it was settled by
very conservative Lutheran Bavarians. But yes, it sure does stick out.
Also, there's another Dutch patch in Wisconsin just south of Sheboygan around a village named Oostburg. It doesn't stick out much on the maps since most of the areas around it are already >65% R anyway. But a careful analysis by precinct does show it to be more Republican than the rest of southern Sheboygan County.