4 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Madison | 1 | 11,994 | 12,336 | -0.47% | 1,388 | 9 | City |
| Hanover | 2 | 3,870 | 3,741 | 0.57% | 1,742 | 2 | Town |
| Dupont | 3 | 336 | 341 | -0.3% | 333 | 1 | Town |
| Brooksburg | 4 | 69 | 72 | 0% | 676 | 0 | Town |
Madison is the largest city in Jefferson County, with a population of 11,994.
Brooksburg is the smallest city in Jefferson County, with a population of 69.
There are 4 cities in Jefferson County, Indiana.