Based on the 2020 United States census, the city had a total population of 25,485.

[4] It is located north of St. Louis-Lambert International Airport and is situated on Interstates 270 and 170, as well as the much-traveled Lindbergh Boulevard and Highway 370.

[5] The 2020 United States census[7] counted 25,458 people, 11,205 households, and 6,323 families in Hazelwood.

Of all households, 38.7% consisted of individuals and 12.1% had someone living alone who was 65 years of age or older.

Gateway Legacy Christian Academy, an international boarding school with students from over 30 countries, is presently located at the historic former St. Stanislaus Seminary.

[12] St. Louis County Library operates the Prairie Commons Branch in Hazelwood.

The city is home to a substantial workforce with 17,063 jobs as of 2015, according to the U.S. Census Bureau.

[15] The city was home to a Ford plant from 1948 to 2006 and employed 1,400 at the time of closure.

[16] The site of the former plant is in the process of being redeveloped into Aviator Business Park.

[17] On the opposite side of Lindbergh Blvd., after the completion of one building in 2007, the Great Recession and ownership troubles stalled the now-named Hazelwood Logistics Center until the land was sold in 2015.

The new owners finishing building out the park with a total of 1.8 million square feet of industrial space completed and leased between 2015 and mid-2018.

[18] TradePort is a 325-acre industrial park under construction north of the St. Louis Outlet Mall (formerly St. Louis Mills) that upon completion in the mid-2020s will feature up to 4 million square feet of new industrial development.

[19] Hazelwood is home to the headquarters of Mallinckrodt Pharmaceuticals and several facilities for Boeing.