Mount Plymouth, FL has a population of 5,525 and is the 6,060th largest city in the United States. The population density is 1,912 per sq mi which is 551% higher than the Florida average and 2010% higher than the national average. The median age in Mount Plymouth is 34 which is approximately 18% lower than the Florida average of 42. In Mount Plymouth, 50% of the population over 15 years of age are married, 94% speak English and 6% speak Spanish. 57% of Mount Plymouth residents were born in Florida, 36% were born out of state, 2% were born outside of the United States and 5% were foreign born.