San Augustine County is a county located in the U.S. state of Texas. As of the 2020 census, its population was 7,918. Its county seat is San Augustine. San Augustine County was formed in 1837. It was supposedly named after Saint Augustine of Hippo, but more plausibly, the county was named for the town of San Augustine, which had been established fiv…San Augustine County is a county located in the U.S. state of Texas. As of the 2020 census, its population was 7,918. Its county seat is San Augustine. San Augustine County was formed in 1837. It was supposedly named after Saint Augustine of Hippo, but more plausibly, the county was named for the town of San Augustine, which had been established five years earlier and whose name was based upon an 18th-century Spanish presidio, the Presidio de San Agustín de Ahumada, named for Agustín de Ahumada, 2nd Marquess of Amarillas.
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