McMullen County is located in Texas. The county covers 1,143 square miles (731,334 acres), equaling zero percent of the state's total area. Of the 254 counties in Texas, McMullen County ranks 249th in terms of the size of its population (820, according to 2015 Census estimates). Mining and mineral extraction-related services are the main economic drivers in this part of Texas. Recent data from Lands of America calculates the average value of land for sale in McMullen County at $2,231 per acre. The average list price of property and land for sale was $3,043,817 (the most expensive listing being for $5.5 million) and the median size of land and property for sale in McMullen County was 1,308 acres. Land for sale in McMullen County totaled 10,917 acres and $24.4 million in overall land value, with the city of Calliham featuring the most land for sale in the county. Farmland was the most common type of land for sale in McMullen County.