In 2022, the population of Sumner was 257, a 3.02% decrease year-by-year from 2021. Previously, in 2021, Sumner's population was 265, a decline of 3.28% compared to a population of 274 in 2020.
The median age in Sumner, MS is 46.4, as per 2021 ACS 5-Year Estimates. Of the total population, 21.64% were under the age of 15, 16.39% aged 15 to 29, 44.26% aged 30 to 64, 16.72% aged 65 to 84, and 0.98% were 85 years of age and older.