The total population of Clarksville is estimated to be 208 with 98 males (47.12%) and 110 females (52.88%). There are 12 more females than males in Clarksville.
In 2022, the population of Clarksville was 189, a 1.05% decrease year-by-year from 2021. Previously, in 2021, Clarksville's population was 191, a decline of 1.55% compared to a population of 194 in 2020.
The median age in Clarksville, PA is 37.6, as per 2021 ACS 5-Year Estimates. Of the total population, 10.06% were under the age of 15, 27.81% aged 15 to 29, 51.48% aged 30 to 64, 10.06% aged 65 to 84, and 0.59% were 85 years of age and older.