It was named for Erastus "Deaf" Smith, a famous scout of the Texas Revolution. In 1876 the Texas legislature formed Deaf Smith County from the Bexar District. After an election on December 1, 1890, the county was organized with the new town of La Plata as county seat. Hereford became the county seat after an election on November 8, 1898, and La Plata soon faded into oblivion.

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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.