| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Atlanta | 1 | 5,490 | 5,435 | 0.22% | 439 | 13 | City |
| Linden | 2 | 1,807 | 1,822 | -0.11% | 512 | 4 | City |
| Hughes Springs | 3 | 1,519 | 1,588 | -0.78% | 609 | 2 | City |
| Queen City | 4 | 1,391 | 1,405 | -0.14% | 393 | 4 | City |
| Avinger | 5 | 379 | 378 | 0% | 195 | 2 | Town |
| Bloomburg | 6 | 330 | 318 | 0.61% | 328 | 1 | Town |
| Douglassville | 7 | 214 | 212 | 0% | 34 | 6 | Town |
| Marietta | 8 | 115 | 115 | 0% | 199 | 1 | Town |
| Domino | 9 | 85 | 74 | 2.41% | 188 | 0 | Town |
Atlanta is the largest city in Cass County, with a population of 5,490.
Domino is the smallest city in Cass County, with a population of 85.
There are 9 cities in Cass County, Texas.