In 2022, the population of Dover was 134, a 0.00% decrease year-by-year from 2021. Previously, in 2021, Dover's population was 134, a decline of 1.47% compared to a population of 136 in 2020.
The median age in Dover, IL is 56.4, as per 2021 ACS 5-Year Estimates. Of the total population, 10.40% were under the age of 15, 11.20% aged 15 to 29, 46.40% aged 30 to 64, 29.60% aged 65 to 84, and 2.40% were 85 years of age and older.