[2] The library has a collection of 5 million items and serves as regional federal documents depository for the state.

[3] The library oversees the Talking Book and Braille Service which offers audio and braille library service to Illinois residents with print disabilities or other disabilities.

[5] The original state library was located next to the office of Stephen A. Douglas while he was Secretary of State.

[6] It moved into the west wing of the State Capitol's third floor in October 1887.

[8] The library which was designed by Chicago architectural firm Graham, Anderson, Probst and White.