St. Charles County

St. Charles County is a county in Missouri, United States. The population in St. Charles County was 416,659 in 2023. The median age in St. Charles County was 39.6 in 2023. The median income in St. Charles County was $50,056 in 2023. The unemployment rate in St. Charles County was 2.6% in 2024. The percentage of people with obesity in St. Charles County was 36.1% in 2022. The percentage of people who binge drink in St. Charles County was 21.9% in 2022. The percentage of people who smoke in St. Charles County was 15.8% in 2022.