17 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Brown | 1 | 14,364 | 13,445 | 1.58% | 643 | 22 | Township |
| Martinsville | 2 | 11,958 | 11,925 | 0.05% | 1,306 | 9 | City |
| Mooresville | 3 | 10,172 | 9,446 | 1.45% | 1,517 | 7 | Town |
| Clay | 4 | 4,329 | 4,250 | 0.72% | 144 | 30 | Township |
| Jackson | 5 | 3,738 | 3,687 | 0.59% | 105 | 36 | Township |
| Green | 6 | 3,692 | 3,629 | 0.68% | 111 | 33 | Township |
| Jefferson | 7 | 3,670 | 3,598 | 0.77% | 105 | 35 | Township |
| Gregg | 8 | 3,030 | 2,958 | 0.8% | 119 | 25 | Township |
| Brooklyn | 9 | 2,615 | 2,514 | 0.77% | 2,641 | 1 | Town |
| Monrovia | 10 | 2,480 | 1,690 | 6.8% | 1,382 | 2 | Town |
| Ashland | 11 | 1,830 | 1,766 | 0.99% | 58 | 32 | Township |
| Ray | 12 | 1,611 | 1,569 | 0.88% | 63 | 26 | Township |
| Harrison | 13 | 1,571 | 1,541 | 0.77% | 183 | 9 | Township |
| Adams | 14 | 1,246 | 1,213 | 0.97% | 42 | 30 | Township |
| Morgantown | 15 | 993 | 1,016 | -0.5% | 2,627 | 0 | Town |
| Baker | 16 | 739 | 718 | 0.96% | 48 | 15 | Township |
| Paragon | 17 | 575 | 558 | 0.52% | 2,091 | 0 | Town |
Brown is the largest city in Morgan County, with a population of 14,364.
Paragon is the smallest city in Morgan County, with a population of 575.
There are 17 cities in Morgan County, Indiana.