Hazelwood is a second-ring suburb of St. Louis, located in northwestern St. Louis County, Missouri. The population was 25,703 as of the 2010 census.[6] Hazelwood, a northern suburb of St. Louis, is located north of Lambert-St. Louis International Airport and is situated on Interstates 270 and 170, as well as the much-traveled Lindbergh Boulevard and Highway 370.