| Name | Saint Johns County |
| State | Florida |
| FIPS Code | 12109 |
| County Seat | St. Augustine |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2024) | 321,510 |
| Population Growth Rate(2020-2024) | 14.96% |
| Majority Ethnicity | White 82.29% |
| Public School Majority Ethnicity | White 70% |
| Partisan Voting Index | Republican:+16 |
| Unemployment Rate (May 2026) | 5.0% |
| Area Code(s) | 324 / 904 / 386 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 82.29% |
| African American | 5.3% |
| Hispanic | 8.8% |
| Asian | 3.45% |
| Native American | 0.1% |
| Hawaiin/Pacific Islander | 0.07% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 69.98% |
| African American | 5.86% |
| Hispanic | 12.54% |
| Asian | 5.59% |
| Native American | 0.16% |
| Hawaiin/Pacific Islander | 0.17% |