Rio Frio is located in the state of Mexico. It was the 58th largest postal district, based on the number of stamps used, and 58th by total value of all stamps used, and thus the smallest of all districts. The average cost of the stamps used was 1.00 reales, since only 6 un real stamps were ever used! I have found no population data for Rio Frio.
Rio Frio had no sub-offices.
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Rio Frio was a sub-office under the General Post Office in Mexico City.
None of the six (!) stamps used are known to exist today.
Rio Frio did not overprint their stamps.
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