10 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Trumann | 1 | 7,411 | 7,481 | -0.19% | 1,264 | 6 | City |
| Harrisburg | 2 | 2,194 | 2,221 | -0.27% | 904 | 2 | City |
| Marked Tree | 3 | 2,169 | 2,277 | -1% | 376 | 6 | City |
| Lepanto | 4 | 1,614 | 1,731 | -1.47% | 1,032 | 2 | City |
| Tyronza | 5 | 664 | 717 | -1.63% | 427 | 2 | City |
| Weiner | 6 | 606 | 645 | -1.3% | 444 | 1 | City |
| Payneway | 7 | 216 | 296 | 6.93% | 40 | 5 | CDP |
| Fisher | 8 | 168 | 178 | -1.18% | 564 | 0 | City |
| Rivervale | 9 | 84 | 76 | 7.69% | 226 | 0 | CDP |
| Waldenburg | 10 | 49 | 53 | -2% | 360 | 0 | Town |
Trumann is the largest city in Poinsett County, with a population of 7,411.
Waldenburg is the smallest city in Poinsett County, with a population of 49.
There are 10 cities in Poinsett County, Arkansas.