St. Louis County Library

St. Louis County Library
The Grant's View Branch of the library, in August 2021
38°37′48″N 90°24′18″W / 38.63012°N 90.40492°W / 38.63012; -90.40492
Location	St. Louis County, Missouri
Established	1946
Branches	20
Collection
Size	1,667,721 (2023)[1]
Access and use
Circulation	11,023,266 (2023)[1]
Population served	859,639 (2023)
Other information
Budget	$60 mil. (2020)
Director	Kristen Sorth[2]
Website	http://www.slcl.org.

St. Louis County Library (SLCL) is a library system that serves residents of St. Louis County, Missouri, United States. It is the busiest public library in Missouri, circulating more than 11 million items in 2023.^[3] It consists of 20 branches, including the Headquarters branch, which is located at 1640 S. Lindbergh Blvd in Ladue, Missouri.

St. Louis County Library is supported by the St. Louis County Library District, which includes most of St. Louis County. SLCL has reciprocal borrowing agreements with most of the other libraries in St. Louis County, as well as with the St. Louis Public Library and the St. Charles City-County Library. In 2018 the library joined the MOBIUS and Prospector loan systems.

The St. Louis County Library District is governed by a Board of Trustees, consisting of five members appointed by the County Council based on a recommendation of the County Executive. The Board of trustees is responsible for selecting and appointing a Library Director. The Director is the chief executive officer of the Library and is responsible for the execution of the orders and policies adopted by the Board. Information concerning the establishment and governance of the Library District can be found in Chapter 182 of the Missouri State Statutes.^[4]