Information concerning the establishment and governance of the Library District can be found in Chapter 182 of the Missouri State Statutes.

[4] The St. Louis County Library District was established as a political subdivision of the State of Missouri with taxing authority by an election held in April 1946.

[4] In 2020, St. Louis County Library announced that it will no longer charge fines on late materials.

[6][7] Items available to borrow include books, DVDs, CDs, audiobooks, video games, binoculars, laptops (along with WiFi hotspots), fishing equipment, musical instruments, projectors, and telescopes.

[8] Patrons also have access to various online resources, downloadable eBooks, audiobooks, magazines, and some web streaming content (movies and TV).

[10] In addition to books and other library materials, SLCL offers free programs and services including computer classes, small business assistance, job help, storytimes, STEM programming, summer and winter reading clubs, individualized help, and more.

Founded in 1998, History & Genealogy at St. Louis County library features a research collection of over 95,000 print volumes, 850 periodical titles, and over 40,000 microfilms.

History & Genealogy offers access to substantial holdings for Atlantic states, the Northwest Territory, the Louisiana Purchase, and sources for Canada, Germany, Switzerland, France, and the British Isles.