10 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Fort Smith | 1 | 90,844 | 89,159 | 0.37% | 1,415 | 64 | City |
| Greenwood | 2 | 9,781 | 9,523 | 0.52% | 898 | 11 | City |
| Barling | 3 | 5,406 | 4,795 | 2.31% | 526 | 10 | City |
| Lavaca | 4 | 2,547 | 2,450 | 0.75% | 1,146 | 2 | City |
| Hackett | 5 | 860 | 780 | 1.9% | 597 | 1 | City |
| Bonanza | 6 | 611 | 588 | 0.66% | 219 | 3 | City |
| Hartford | 7 | 497 | 501 | -0.2% | 276 | 2 | City |
| Huntington | 8 | 487 | 489 | -0.2% | 723 | 1 | City |
| Central City | 9 | 470 | 468 | 0% | 211 | 2 | Town |
| Midland | 10 | 225 | 225 | 0% | 650 | 0 | Town |
Fort Smith is the largest city in Sebastian County, with a population of 90,844.
Midland is the smallest city in Sebastian County, with a population of 225.
There are 10 cities in Sebastian County, Arkansas.