| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Fort Smith | 1 | 91,251 | 89,156 | 0.44% | 1,422 | 64 | City |
| Greenwood | 2 | 9,845 | 9,534 | 0.53% | 859 | 11 | City |
| Barling | 3 | 5,574 | 4,791 | 2.24% | 543 | 10 | City |
| Lavaca | 4 | 2,546 | 2,448 | 0.71% | 1,146 | 2 | City |
| Hackett | 5 | 873 | 783 | 1.87% | 606 | 1 | City |
| Bonanza | 6 | 608 | 585 | 0.83% | 218 | 3 | City |
| Hartford | 7 | 498 | 502 | -0.2% | 277 | 2 | City |
| Huntington | 8 | 486 | 489 | 0% | 721 | 1 | City |
| Central City | 9 | 469 | 467 | 0% | 211 | 2 | Town |
| Midland | 10 | 224 | 225 | 0% | 647 | 0 | Town |
Fort Smith is the largest city in Sebastian County, with a population of 91,251.
Midland is the smallest city in Sebastian County, with a population of 224.
There are 10 cities in Sebastian County, Arkansas.