High Ridge is a suburb of St. Louis and census-designated place in Jefferson County, Missouri, United States. The population was 4,257 at the 2020 census. At 927 feet above sea level, High Ridge is th…High Ridge is a suburb of St. Louis and census-designated place in Jefferson County, Missouri, United States. The population was 4,257 at the 2020 census. At 927 feet above sea level, High Ridge is the second-highest point in Jefferson County, second only to Sun Ridge, north of Hillsboro, according to data from the House Springs/Hillsboro 7.5 minute topographic quadrangles. The Beaumont Scout Reservation, a property of the Greater St. Louis Area Council, Boy Scouts of America, is 4 miles north of High Ridge.
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