USA.com / New York / Suffolk County / Fort Salonga, NYFort Salonga is located in southeast New York. Fort Salonga is part of Suffolk County. Fort Salonga has 9.83 square miles of land area and 0.11 square miles of water area. As of 2010-2014, the total Fort Salonga population is 9,895, which has grown 2.71% since 2000. The population growth rate is lower than the state average rate of 3.26% and ..