On behalf of the Fire Board of Commissioners of the Sanibel Fire and Rescue District welcome to our website. Sanibel Island is approximately 17 square miles in size with over 15 miles of beach frontage. Sanibel Island also boasts over 12,000 acres of conservation land consisting of parcels owned by the J. N. "Ding" Darling National Wildlife Refuge, Sanibel/Captiva Conservation Foundation, and the City of Sanibel public parks. Sanibel Island has a population of approximately 6,000 year-round residents with populations exceeding 20,000 during winter months. An average temperature of 74 degrees and many sunny days make for an incredible environment.