POST, TEXAS. Post, the county seat of Garza County, is on the Santa Fe Railroad at the junction of U.S. highways 84 and 380, east of the Caprock escarpment near the west central part of the county. The town began under the name Post City in 1907 as a colonizing venture of cereal manufacturer Charles William Post,who sought to develop a model town. He purchased 200,000 acres of ranchland and established the Double U. Company to manage the town's construction.