| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Unionville | 1 | 1,649 | 1,722 | -0.84% | 826 | 2 | City |
| Worthington | 2 | 56 | 59 | -1.75% | 444 | 0 | Village |
| Lucerne | 3 | 54 | 56 | -1.82% | 216 | 0 | Village |
| Livonia | 4 | 53 | 55 | -1.85% | 199 | 0 | Village |
| Powersville | 5 | 42 | 42 | 0% | 74 | 1 | Village |
Unionville is the largest city in Putnam County, with a population of 1,649.
Powersville is the smallest city in Putnam County, with a population of 42.
There are 5 cities in Putnam County, Missouri.