3 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Rosiclare | 1 | 938 | 988 | -0.85% | 484 | 2 | City |
| Elizabethtown | 2 | 219 | 230 | -0.9% | 311 | 1 | Village |
| Cave-In-Rock | 3 | 217 | 228 | -0.91% | 580 | 0 | Village |
Rosiclare is the largest city in Hardin County, with a population of 938.
Cave-In-Rock is the smallest city in Hardin County, with a population of 217.
There are 3 cities in Hardin County, Illinois.