Between the Texas Revolution and the Mexican War (1836-46), most of Dimmit County lay in the disputed area between the Rio Grande and the Nueces River. Since neither the Republic of Texas nor the Mexican government could establish control over this strip of contested land, known at the time as Wild Horse Desert or El Desierto Muerto (Dead Desert), it became a haven for desperate characters. This remained true for years after the Treaty of Guadalupe Hidalgo definitively assigned the Nueces Strip to Texas. In 1858, Dimmit County was officially formed from parts of Bexar, Webb, Maverick, and Uvalde Counties. Dangers posed by outlaws and unfriendly Indians, however, deterred settlement in the county until after the Civil War. The county was formally organized in 1880 with Carrizo Springs as county seat. -Handbook of Texas Online: Dimmit 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.