8 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| World Golf Village | 1 | 24,594 | 18,937 | 3.44% | 910 | 27.02 | CDP |
| Palm Valley | 2 | 19,703 | 20,540 | -0.11% | 1,616 | 12.20 | CDP |
| St. Augustine | 3 | 16,202 | 14,686 | 1.91% | 1,702 | 9.52 | City |
| St. Augustine Shores | 4 | 10,514 | 9,818 | 2.04% | 2,398 | 4.38 | CDP |
| St. Augustine South | 5 | 5,109 | 4,994 | 0.14% | 3,223 | 1.58 | CDP |
| Sawgrass | 6 | 4,876 | 4,094 | 0% | 1,612 | 3.02 | CDP |
| Vilano Beach | 7 | 2,864 | 2,453 | 7.15% | 1,615 | 1.77 | CDP |
| Hastings | 8 | 1,122 | 1,304 | 7.06% | 346 | 3.24 | CDP |
World Golf Village is the largest city in St. Johns County, with a population of 24,594.
Hastings is the smallest city in St. Johns County.
There are 8 cities in St. Johns County, Florida.