Among CHPL's collections are books, audiobooks, downloadable digital audio and e-books, magazines, newspapers, CDs, videos, DVDs, CD-ROMs, sheet music, slides, microfilm, microfiche, and Braille. It offers free in-building computer access and Wi-Fi, as well as loaning Wi-Fi hotspots for use at home. The system collectively offered over 17,000 free programs in 2019, including classes, lectures, book clubs, performances, storytimes, and much more. In 2019, its staff answered 1.6 million reference questions by phone, online chat, fax, e-mail, post, and in person. The Main Branch is a selective federal depository library.