All St. Charles County population data above are from the US Census Bureau except for the population projection data, which are from the Missouri Office of Administration. Division of Budget and Planning. 2000 to 2030 Projections. Downloaded April 2014.
With 379,493 people, St. Charles County is the 3rd most populated county in the state of Missouri out of 114 counties. But watch out, St. Charles County, because Clay County with 233,682 people and Greene County with 285,865 people are right behind you.
The largest St. Charles County racial/ethnic groups are White (88.3%) followed by Black (4.2%) and Hispanic (3.0%).
In 2013, the median household income of St. Charles County residents was $70,137. St. Charles County households made slightly more than Cass County households ($64,144) and Platte County households ($63,438) . However, 6.1% of St. Charles County residents live in poverty.
The median age for St. Charles County residents is 37.7 years young.
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