5 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Palatka | 1 | 11,064 | 10,472 | 0.9% | 1,104 | 10 | City |
| Crescent City | 2 | 1,755 | 1,661 | 0.92% | 850 | 2 | City |
| Interlachen | 3 | 1,547 | 1,429 | 1.31% | 254 | 6 | Town |
| Pomona Park | 4 | 845 | 782 | 1.32% | 278 | 3 | Town |
| Welaka | 5 | 783 | 723 | 1.29% | 528 | 1 | Town |
Palatka is the largest city in Putnam County, with a population of 11,064.
Welaka is the smallest city in Putnam County, with a population of 783.
There are 5 cities in Putnam County, Florida.