4 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Mount Carmel | 1 | 6,666 | 6,981 | -0.77% | 1,386 | 5 | City |
| Allendale | 2 | 436 | 456 | -0.68% | 1,420 | 0 | Village |
| Bellmont | 3 | 236 | 244 | -0.42% | 726 | 0 | Village |
| Keensburg | 4 | 169 | 177 | -0.59% | 650 | 0 | Village |
Mount Carmel is the largest city in Wabash County, with a population of 6,666.
Keensburg is the smallest city in Wabash County, with a population of 169.
There are 4 cities in Wabash County, Illinois.