High Ridge is an unincorporated community and census-designated place (CDP) in Jefferson County, Missouri, United States. The population was 4,305 at the 2010 census. At 927 feet (283 m) 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 (6 km) north of High Ridge.
High Ridge is located in northern Jefferson County at 38°27′57″N 90°31′39″W (38.465787, -90.527517). It is bordered to the north by Peaceful Village and Parkville. Missouri Route 30 runs through the community, leading northeast 23 miles (37 km) to downtown St. Louis and southwest 31 miles (50 km) to St. Clair.