North Key Largo, FL has a population of 1,038 and is the 14,920th largest city in the United States. The population density is 56 per sq mi which is 81% lower than the Florida average and 38% lower than the national average. The median age in North Key Largo is 66 which is approximately 58% higher than the Florida average of 42. In North Key Largo, 67% of the population over 15 years of age are married, 92% speak English and 2% speak Spanish. 11% of North Key Largo residents were born in Florida, 70% were born out of state, 0% were born outside of the United States and 20% were foreign born.