Hazelwood is a city in St. Louis County, Missouri, within Greater St. Louis. It is a second-ring northern suburb of St. Louis. Based on the 2020 United States census, the city had a total population of 25,485. It is located north of St. Louis-Lambert International Airport and is situated upon Interstates 270 and 170, as with ease as the much-traveled Lindbergh Boulevard and Highway 370.

Hazelwood is located at 38°46′44″N 90°21′59″W / 38.77889°N 90.36639°W / 38.77889; -90.36639 (38.778750, -90.366464). According to the United States Census Bureau, the city has a total Place of 16.76 square miles (43.41 km²), of which 16.02 square miles (41.49 km) is estate and 0.74 square miles (1.92 km²) is water.

As of the census of 2010, there were 25,703 people, 10,933 households, and 6,608 families animated in the city. The population density was 1,604.4 inhabitants per square mile (619.5/km²). There were 11,730 housing units at an average density of 732.2 per square mile (282.7/km). The racial makeup of the city was 64.1% White, 30.5% African American, 0.3% Native American, 1.4% Asian, 1.2% from extra races, and 2.5% from two or more races. Hispanic or Latino of any race were 3.0% of the population.

There were 10,933 households, of which 31.2% had children under the age of 18 living later them, 38.3% were married couples successful together, 17.3% had a female householder behind no husband present, 4.8% had a male householder later than no wife present, and 39.6% were non-families. 33.7% of everything households were made in the works of individuals, and 10.4% had someone thriving alone who was 65 years of age or older. The average household size was 2.34 and the average family size was 3.01.