5 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hardin | 1 | 750 | 794 | -0.92% | 352 | 2 | Village |
| Kampsville | 2 | 285 | 305 | -1.04% | 279 | 1 | Village |
| Batchtown | 3 | 154 | 165 | -1.28% | 83 | 2 | Village |
| Brussels | 4 | 112 | 121 | -0.88% | 200 | 1 | Village |
| Hamburg | 5 | 92 | 98 | -1.08% | 176 | 1 | Village |
Hardin is the largest city in Calhoun County, with a population of 750.
Hamburg is the smallest city in Calhoun County, with a population of 92.
There are 5 cities in Calhoun County, Illinois.