Loading view. There were no results found. There were no results found. Monroe County Public Library, Marathon Branch Events Venues Monroe County Public Library, Marathon Branch 3251 Overseas Hwy Marathon, FL 33050 United States Get Directions keyslibraries.org Events at this venue Today Upcoming Upcoming Select date. Previous Events Today Next Events Subscribe to calendar Google Calendar iCalendar Outlook 365 Outlook Live Export .ics file Export Outlook .ics file