Big Coppitt Key, FL has a population of 3,062 and is the 8,714th largest city in the United States. The population density is 2,654 per sq mi which is 804% higher than the Florida average and 2829% higher than the national average. The median age in Big Coppitt Key is 45 which is approximately 8% higher than the Florida average of 42. In Big Coppitt Key, 48% of the population over 15 years of age are married, 78% speak English and 15% speak Spanish. 38% of Big Coppitt Key residents were born in Florida, 44% were born out of state, 0% were born outside of the United States and 18% were foreign born.