Template:Wp-Saint Charles County, Missouri

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St. Charles County is in the central eastern part of the U.S. state of Missouri. As of the 2020 census, the population was 405,262, making it Missouri's third-most populous county. Its county seat is St. Charles. The county was organized October 1, 1812, and named for Saint Charles Borromeo, an Italian cardinal. The county executive is Steve Ehlmann, since January 2007.

St. Charles County is part of the St. Louis, MO-IL Metropolitan Statistical Area and contains many of the city's northwestern suburbs.

The wealthiest county in Missouri, St. Charles County is one of the nation's fastest-growing counties.

St. Charles County includes an area of vineyards and wineries whose distinction has been nationally recognized. On its rural outer edge along the south-facing bluffs above the Missouri River is an area of numerous wineries, so that Missouri Route 94 is sometimes called the Missouri Weinstrasse. The area includes the Augusta AVA, designated in 1980 as the first American Viticultural Area by the federal government.