The White Oak Library District serves more than 75,000 residents in Romeoville, Lockport and Crest Hill. It was established as a volunteer library in 1921, becoming the tax-supported Lockport Township Free Public Library eight years later. A Crest Hill branch was established in 1969. In 1981, the libraries separated from Lockport Township to form the Des Plaines Valley Public Library District, eventually adding a third branch in Romeoville. In July 2011, the district underwent a name change, officially becoming the White Oak Library District.

Today, patrons have access to more than 250,000 items, from books to DVDs, CDs, newspapers, magazines and more, as well as inter-library loan rentals, online databases, programs, activities and public meeting rooms.