In 2022, the population of Mullin was 129, a 1.57% increase year-by-year from 2021. Previously, in 2021, Mullin's population was 127, an increase of 0.79% compared to a population of 126 in 2020.
The median age in Mullin, TX is 43.9, as per 2021 ACS 5-Year Estimates. Of the total population, 9.24% were under the age of 15, 30.43% aged 15 to 29, 38.59% aged 30 to 64, 13.04% aged 65 to 84, and 8.70% were 85 years of age and older.