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is a census-designated place (CDP) in Jefferson County, Missouri, United States. The population was 4,236 at the 2000 census. At above sea level, High Ridge is the second highest point in Missouri. It is also home to Olympic triathlete Sarah Haskins, who competed in the 2008 Olympics in Beijing, China.
According to the United States Census Bureau, the CDP has a total area of 4.0 square miles (10.3 km²), all of it land.