The ages, races, and population density of st. Johns county, florida tell a story. Understand the shifts in demographic trends with these charts visualizing decades of population data. Webcensus data for st. Johns county, fl (pop. 306,841), including age, race, sex, income, poverty, marital status, education and more. Quickfacts provides statistics for all states and counties, and for cities and towns with a population of 5,000 or more. Webcensus bureau data search results. Johns county, florida geography. Total population in st. Johns county, florida is 273,425. Webpopulation estimates are updated annually using current data on births, deaths, and migration to calculate population change since the most recent decennial. Quickfacts provides statistics for all states and counties, and for cities and towns with a population of 5,000 or more. Johns county is growing faster than any other county in florida, with more than 15,000 new residents in a year, according to new census data.
