The Grant R. Brimhall Library serves as the main library for the city of Thousand Oaks, California. It is controlled by the Thousand Oaks Library System, which also controls the Newbury Park Branch Library. The Grant R. Brimhall Building is located on Janss Rd. near State Route 23. There are 81,000 square feet (7,500 m2) in the main building and 3,000 square feet (280 m2) in the adjacent Special Collections Storage building. It serves Thousand Oaks, including Newbury Park and Westlake Village. It is the largest library in Ventura County, the largest library in the region, and one of the largest in Southern California.

American Radio Archives is located within the Thousand Oaks Library in Thousand Oaks, California and contains one of the largest collections of radio broadcasting in the United States and in the world. The archives was established in 1984 by the Thousand Oaks Library Foundation. The collections include 23,000 radio and TV scripts, 10,000 photographs, 10,000 books on radio history, and 5,000 audio recordings. The archives also house manuscripts, sound recordings, scripts, books, photographs and other materials related to the history of radio and radio broadcasting.