| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| New London | 1 | 990 | 936 | 0.92% | 1,427 | 1 | City |
| Perry | 2 | 689 | 669 | 0.44% | 498 | 1 | City |
| Center | 3 | 543 | 536 | 0.18% | 1,331 | 0 | City |
New London is the largest city in Ralls County, with a population of 990.
Center is the smallest city in Ralls County, with a population of 543.
There are 3 cities in Ralls County, Missouri.