Cudjoe Key, FL has a population of 1,812 and is the 11,607th largest city in the United States. The population density is 350 per sq mi which is 19% higher than the Florida average and 287% higher than the national average. The median age in Cudjoe Key is 56 which is approximately 33% higher than the Florida average of 42. In Cudjoe Key, 67% of the population over 15 years of age are married, 86% speak English and 11% speak Spanish. 20% of Cudjoe Key residents were born in Florida, 71% were born out of state, 1% were born outside of the United States and 9% were foreign born.