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| Rio 708 |
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| Rio 834 |
Rio, Wisconsin, is a village in Columbia County along state highway 16 about 15 miles southeast of Portage. Note that it is pronounced RYE-oh, not REE-oh (as in Rio de Janeiro). It has just over 1000 residents.
Delos Bundy, the first postmaster, requested that the settlement be called Ohio, but when authorized, the name appeared as Rio - for reasons unknown.