| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| St. Augustine | 1 | 16,476 | 14,698 | 2.08% | 1,730 | 10 | City |
St. Augustine is the largest city in St. Johns County, with a population of 16,476.
St. Augustine is the smallest city in St. Johns County, with a population of 16,476.
There is 1 city in St. Johns County, Florida.