Quincy, FL has a population of 7,743 and is the 4,818th largest city in the United States. The population density is 668 per sq mi which is 127% higher than the Florida average and 637% higher than the national average. The median age in Quincy is 40 which is approximately 4% lower than the Florida average of 42. In Quincy, 43% of the population over 15 years of age are married, 88% speak English and 10% speak Spanish. 77% of Quincy residents were born in Florida, 17% were born out of state, 1% were born outside of the United States and 5% were foreign born.