10 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Trumann | 1 | 7,333 | 7,500 | -0.45% | 1,250 | 5.87 | City |
| Harrisburg | 2 | 2,203 | 2,217 | -0.14% | 908 | 2.43 | City |
| Marked Tree | 3 | 2,153 | 2,275 | -1.1% | 373 | 5.77 | City |
| Lepanto | 4 | 1,611 | 1,733 | -1.47% | 1,030 | 1.56 | City |
| Tyronza | 5 | 662 | 717 | -1.63% | 426 | 1.55 | City |
| Weiner | 6 | 604 | 646 | -1.31% | 443 | 1.36 | City |
| Payneway | 7 | 216 | 296 | 6.93% | 40 | 5.33 | CDP |
| Fisher | 8 | 169 | 179 | -1.17% | 567 | 0.30 | City |
| Rivervale | 9 | 84 | 76 | 7.69% | 226 | 0.37 | CDP |
| Waldenburg | 10 | 51 | 55 | -1.92% | 375 | 0.14 | Town |
Trumann is the largest city in Poinsett County, with a population of 7,333.
Waldenburg is the smallest city in Poinsett County.
There are 10 cities in Poinsett County, Arkansas.