Downieville is a CDP located in Sierra County, California. Downieville has a 2026 population of 149. It is also the county seat of Sierra County. Downieville is currently declining at a rate of -5.1% annually and its population has decreased by 0% since the most recent census, which recorded a population of 0 in 2020.
The median age in Downieville is 46.6 years: 46.4 years for males, and 65.1 years for females. For every 100 females there are 250.0 males.
Data after 2023 is projected based on recent change
Overall: 46.6 years
Female: 65.1 years
Male: 46.4 years
There are 126 adults, (42 of whom are seniors) in Downieville.
Female: 36 (28.6%)
Male: 90 (71.4%)
The racial composition of Downieville includes 67.46% White, 7.14% other race, 6.35% Black or African American, and smaller percentages for and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 85 | 67.46% |
| Two or more races | 24 | 19.05% |
| Other race | 9 | 7.14% |
| Black or African American | 8 | 6.35% |