10 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Fort Smith | 1 | 90,181 | 89,153 | 0.23% | 1,405 | 64.19 | City |
| Greenwood | 2 | 9,769 | 9,524 | 0.5% | 897 | 10.89 | City |
| Barling | 3 | 5,497 | 4,792 | 2.63% | 535 | 10.27 | City |
| Lavaca | 4 | 2,552 | 2,457 | 0.75% | 1,149 | 2.22 | City |
| Hackett | 5 | 888 | 780 | 2.54% | 616 | 1.44 | City |
| Bonanza | 6 | 621 | 588 | 1.14% | 223 | 2.79 | City |
| Hartford | 7 | 494 | 501 | -0.2% | 274 | 1.80 | City |
| Huntington | 8 | 488 | 490 | 0% | 724 | 0.67 | City |
| Central City | 9 | 466 | 465 | 0% | 210 | 2.22 | Town |
| Midland | 10 | 225 | 225 | 0% | 650 | 0.35 | Town |
Fort Smith is the largest city in Sebastian County, with a population of 90,181.
Midland is the smallest city in Sebastian County.
There are 10 cities in Sebastian County, Arkansas.