13 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Addison township | 1 | 22,496 | 21,474 | 1.3% | 811 | 27.74 | Township |
| Shelbyville | 2 | 20,930 | 20,127 | 0.78% | 1,528 | 13.69 | City |
| Moral township | 3 | 4,477 | 4,628 | -1.1% | 123 | 36.54 | Township |
| Jackson township | 4 | 1,929 | 1,996 | -1.13% | 57 | 34.09 | Township |
| Brandywine township | 5 | 1,826 | 1,894 | -1.19% | 82 | 22.20 | Township |
| Flat Rock township | 6 | 1,633 | 1,580 | 0.68% | 53 | 31.06 | Township |
| Noble township | 7 | 1,375 | 1,414 | -0.94% | 38 | 36.29 | Township |
| Morristown | 8 | 1,175 | 1,209 | -0.59% | 306 | 3.84 | Town |
| Hendricks township | 9 | 1,165 | 1,215 | -1.35% | 32 | 36.37 | Township |
| Sugar Creek township | 10 | 1,037 | 1,071 | -1.05% | 43 | 23.90 | Township |
| Union township | 11 | 898 | 928 | -0.99% | 34 | 26.76 | Township |
| Waldron | 12 | 823 | 648 | 0.12% | 655 | 1.26 | CDP |
| Fairland | 13 | 529 | 543 | -0.56% | 463 | 1.14 | Town |
Addison township is the largest city in Shelby County, with a population of 22,496.
Fairland is the smallest city in Shelby County.
There are 13 cities in Shelby County, Indiana.