Clay County was marked off from Cooke County on December 24, 1857, and named for Kentucky statesman Henry Clay. The county was organized in 1861, but it was largely abandoned the following year because of the removal of federal troops during the war. .organized 11/24/1873 -Handbook of Texas Online: Clay County

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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.