10 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Fort Smith | 1 | 91,181 | 89,159 | 0.37% | 1,421 | 64 | City |
| Greenwood | 2 | 9,833 | 9,523 | 0.53% | 858 | 11 | City |
| Barling | 3 | 5,528 | 4,795 | 2.26% | 538 | 10 | City |
| Lavaca | 4 | 2,567 | 2,450 | 0.79% | 1,155 | 2 | City |
| Hackett | 5 | 876 | 780 | 1.86% | 608 | 1 | City |
| Bonanza | 6 | 616 | 588 | 0.82% | 221 | 3 | City |
| Hartford | 7 | 496 | 501 | -0.2% | 275 | 2 | City |
| Huntington | 8 | 487 | 489 | 0% | 723 | 1 | City |
| Central City | 9 | 471 | 468 | 0.21% | 212 | 2 | Town |
| Midland | 10 | 225 | 225 | 0% | 650 | 0 | Town |
Fort Smith is the largest city in Sebastian County, with a population of 91,181.
Midland is the smallest city in Sebastian County, with a population of 225.
There are 10 cities in Sebastian County, Arkansas.