Jewett is a city in Leon County, Texas, United States. The population was 793 at the 2020 census. It was laid out in 1871 by the International R…Jewett is a city in Leon County, Texas, United States. The population was 793 at the 2020 census. It was laid out in 1871 by the International Railroad Company. According to the United States Census Bureau, the city has a total area of 2.1 square miles, of which 2.1 square miles is land and 0.04 square miles is water.