The total population of Belvidere is estimated to be 97 with 48 males (49.48%) and 49 females (50.52%). There are 1 more females than males in Belvidere.
In 2022, the population of Belvidere was 43, a 2.27% decrease year-by-year from 2021. Previously, in 2021, Belvidere's population was 44, an increase of 2.33% compared to a population of 43 in 2020.
The median age in Belvidere, SD is 14.9, as per 2021 ACS 5-Year Estimates. Of the total population, 51.54% were under the age of 15, 3.85% aged 15 to 29, 35.38% aged 30 to 64, 9.23% aged 65 to 84, and 0.00% were 85 years of age and older.