In 2022, the population of Rockham was 20, a 5.26% increase year-by-year from 2021. Previously, in 2021, Rockham's population was 19, a decline of 0.00% compared to a population of 19 in 2020.
The median age in Rockham, SD is 49.5, as per 2021 ACS 5-Year Estimates. Of the total population, 30.77% were under the age of 15, 0.00% aged 15 to 29, 38.46% aged 30 to 64, 30.77% aged 65 to 84, and 0.00% were 85 years of age and older.