St. Charles is a city located in Bear Lake County, Idaho. St. Charles has a 2026 population of 196. St. Charles is currently growing at a rate of 3.16% annually and its population has increased by 20.25% since the most recent census, which recorded a population of 163 in 2020.
The median age in St. Charles is 34.1 years: 50.8 years for males, and 19.9 years for females. For every 100 females there are 126.6 males.
Data after 2023 is projected based on recent change
Overall: 34.1 years
Female: 19.9 years
Male: 50.8 years
There are 119 adults, (42 of whom are seniors) in St. Charles.
Female: 64 (44.1%)
Male: 81 (55.9%)
The racial composition of St. Charles includes 100% White, and smaller percentages for and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 145 | 100% |