Shelby is an unincorporated community in Austin County, Texas, United States. According to the Handbook of Texas, the community had a population of 175 in 2000. It is located within the Texas German belt region, a region stretching from Sealy in the east to Fredericksburg in the west, settled by German emigrants. To this day, Austin County has a …Shelby is an unincorporated community in Austin County, Texas, United States. According to the Handbook of Texas, the community had a population of 175 in 2000. It is located within the Texas German belt region, a region stretching from Sealy in the east to Fredericksburg in the west, settled by German emigrants. To this day, Austin County has a large German Texan population and many people still speak German.