Is St. Charles County the best Missouri county for your business?

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Now you can skip hours of internet research and jump straight to getting answers with our meaningful at-a-glance Demographics Spreadsheet Report. With the most current & most popular demographic data, it's the perfect starting point for your research about St. Charles County and the rest of Missouri.

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St. Charles County Population

All St. Charles County population data above are from the US Census Bureau.

The population data for St. Charles County are from the Census' American Community Survey 2018 5-year estimates and the Census' 2019 Population Estimates. The demographic data for Clay County, Greene County, Platte County, and St. Louis city/county are the most current, comparable demographics available from the US Census Bureau, are from the American Community Survey 2018 5-year estimates, and were downloaded on 19 December 2019. Check out our FAQ section for more details.

St. Charles County Demographics Summary

population icon Population

With 402,022 people, St. Charles County is the 3rd most populated county in the state of Missouri out of 115 counties. But watch out, St. Charles County, because Greene County with 293,086 people and St. Louis city/county with 300,576 people are right behind you.

race icon Race & Ethnicity

The largest St. Charles County racial/ethnic groups are White (87.4%) followed by Black (4.4%) and Hispanic (3.2%).

income icon Median Income

In 2018, the median household income of St. Charles County residents was $81,411. St. Charles County households made slightly more than Clay County households ($68,367) and Platte County households ($76,912) . However, 5.6% of St. Charles County residents live in poverty.

age icon Median Age

The median age for St. Charles County residents is 38.2 years young.


86% of people CANNOT find the data they're looking for on the US Census Bureau website. Source: Nielsen Norman Group

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