Anything posted to this site is public record. Social Media Policy: www.monroecounty-fl.gov/socialmediapolicy. The Marathon Branch of the Monroe County Public Library is located at 3490 Overseas Highway, Marathon. We look forward to serving you in our beautiful new building. Located in the heart of the Florida Keys, the Marathon Branch of the Monroe County Public Library serves the city of Maratho
n and the surrounding Middle Keys area. For the latest news regarding our programs and services follow this page and visit the library website: https://keyslibraries.org/. Find us on Instagram: marathonlibrary_fl and Twitter: . Parents and children, readers and researchers, computer geeks, film lovers, visitors in search of the local atmosphere -- all come to the Marathon Branch to read, browse, learn, expand their horizons, and most of all, enjoy.