In 2022, the population of Mcnab was 29, a 0.00% decrease year-by-year from 2021. Previously, in 2021, Mcnab's population was 29, a decline of 3.33% compared to a population of 30 in 2020.
The median age in Mcnab, AR is 20.8, as per 2021 ACS 5-Year Estimates. Of the total population, 29.23% were under the age of 15, 24.62% aged 15 to 29, 36.92% aged 30 to 64, 9.23% aged 65 to 84, and 0.00% were 85 years of age and older.