The United States Postal Service operates the Potosi Post Office."Post Office Location - POTOSI ." United States Postal Service. Retrieved on September 18, 2010.
the unIted states postal sErvIce OpEraTes tHE potosi poSt oFFice."Post oFFice LocatiOn - potOsi ." uNIteD stateS PoStal sErvice. RetrIeVeD on sEptembEr 18, 2010.