Frio County was formed by the Texas legislature from parts of Atascosa, Bexar, and Uvalde counties on February 1, 1858, but was not organized until May 22, 1871. In the interim the county remained under the jurisdiction of Bexar County. In accordance with the 1871 legislative mandate the county seat was named Frio.

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This list contains or will contain all post offices known from Texas. Noted also are whether recent offices have had at least one precancel type, as listed in the Precancel Stamp Society's Town and Type Catalog of the United States and Territories, Sixth edition, Summer 1998, and from Fosters' personal knowledge. A link is provided to detailed precancel data for that location. The precancel device(s) may or may not still exist. An * indicates a discontinued post office or name change. Pester the active post offices so that devices can be retained or ordered. They may be found many times, but only have to be thrown away once. Precancel devices are not usually issued to branches, stations or contract post offices. Please see plans page for color legend.