St. Johns County, FL Demographics
St. Johns County, FL is the 24th most populous of 67 counties in Florida, with 273,425 residents across 601 square miles. That is about 455 people per square mile.
At the 2020 census
| Population | 273,425 |
|---|---|
| Land area | 601 sq mi |
| Density | 455 / sq mi |
Data: 2020 Census · American Community Survey 2024
How St. Johns County compares to the US
We're computing this county's comparison table — check back shortly. Population, land area, and density above are already exact.
Central Location: St. Johns County, FL
Measured from the county's main population center using 2020 census blocks.
We're computing the drive-time and radius areas around St. Johns County, FL — check back shortly. Meanwhile you can drop a pin anywhere in the radius tool.
Census tracts in St. Johns County, FL
Related places
Other counties nearby
Nearest counties
Metro areas containing St. Johns County
About this page
This page shows demographics for a US county from the 2020 census and the American Community Survey: population, land area, density, urban share, and how the county compares to national averages for income, housing, age, and more.
Counties subdivide into census tracts, listed below with their populations. The drive-time and radius tables measure the population around the county's main population center.