| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Mount Carmel | 1 | 6,676 | 6,981 | -0.7% | 1,388 | 5 | City |
| Allendale | 2 | 433 | 455 | -0.92% | 1,410 | 0 | Village |
| Bellmont | 3 | 240 | 248 | -0.41% | 738 | 0 | Village |
| Keensburg | 4 | 169 | 176 | -0.59% | 650 | 0 | Village |
Mount Carmel is the largest city in Wabash County, with a population of 6,676.
Keensburg is the smallest city in Wabash County, with a population of 169.
There are 4 cities in Wabash County, Illinois.