In 2022, the population of Pax was 132, a 1.49% decrease year-by-year from 2021. Previously, in 2021, Pax's population was 134, a decline of 0.74% compared to a population of 135 in 2020.
The median age in Pax, WV is 55.1, as per 2021 ACS 5-Year Estimates. Of the total population, 8.74% were under the age of 15, 14.56% aged 15 to 29, 63.11% aged 30 to 64, 11.65% aged 65 to 84, and 1.94% were 85 years of age and older.