WebMay 1, 2024 · Important ZIP Code 79847 Information. ZIP Code 79847 is located in the city of Salt Flat, Texas and covers 831.48 square miles of land area. It is also located within Hudspeth County. According to the 2020 U.S. Census, there are 151 people in 74 households. ZIP-Codes.com estimates that the current population is 301.