What is the population of St. Charles County, MO?
St. Charles County in Missouri has a population of 409,830, per Census ACS 5-Year estimates. The median household income is $102,912 and the median age is 39.6.
Context
Counties are the primary administrative subdivisions of states and a stable unit for tracking population. St. Charles County's population reflects everyone within county lines, including residents of incorporated cities and unincorporated areas.
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St. Charles County in Missouri has a population of 409,830, per Census ACS 5-Year estimates. The median household income is $102,912 and the median age is 39.6.