Sachem Public Library in Holbrook is one of the largest school district libraries in New York State outside of New York City. It traces its roots to an 18-book women's suffrage collection in 1914. The library serves over 82,000 district residents in an area that extends over three townships: Brookhaven, Islip, and Smithtown. There are over 260,000 books, 11,000 serials, 7,000 electronic materials and 40,000 media materials housed in the library's 60,000 square foot building. The Sachem Public Library is building a woodland garden that will be the future site of outdoor summer concerts and performances, as well as small discussions, children's story hours, tranquil strolls and even quiet reading.

Middle Country Public Library is a center for continuous learning, offering information, resources and programs to reflect a wide range of views and meet the needs of the diverse surrounding community. The experienced staff demonstrates professional expertise and welcomes on-going community dialogue to evaluate and improve the library's services. Extensive technological resources, collections and innovative services support literacy, economic independence, cultural enrichment, and family health and wellness. The Library is a welcoming place, dedicated to enhancing the quality of community life.

The goal of the Patchogue-Medford Library is to provide educational, cultural and recreational opportunities for the community, and to facilitate and support the informational needs of every community member. The library is a community resource and a center of intellectual freedom which acquires, organizes and disseminates books, non-print materials and services that help educate, enrich, entertain and inform.