1 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| St. Augustine | 1 | 16,369 | 14,687 | 2.1% | 1,719 | 10 | City |
St. Augustine is the largest city in St. Johns County, with a population of 16,369.
St. Augustine is the smallest city in St. Johns County, with a population of 16,369.
There is 1 city in St. Johns County, Florida.