17 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Brown township | 1 | 14,291 | 13,446 | 1.2% | 640 | 22.32 | Township |
| Martinsville | 2 | 11,960 | 11,925 | 0.06% | 1,306 | 9.16 | City |
| Mooresville | 3 | 10,135 | 9,444 | 1.38% | 1,511 | 6.71 | Town |
| Clay township | 4 | 4,359 | 4,245 | 0.97% | 145 | 29.98 | Township |
| Jackson township | 5 | 3,750 | 3,687 | 0.78% | 106 | 35.50 | Township |
| Green township | 6 | 3,709 | 3,625 | 0.9% | 112 | 33.15 | Township |
| Jefferson township | 7 | 3,690 | 3,598 | 0.96% | 106 | 34.97 | Township |
| Gregg township | 8 | 3,044 | 2,958 | 1.06% | 120 | 25.43 | Township |
| Brooklyn | 9 | 2,624 | 2,514 | 0.85% | 2,651 | 0.99 | Town |
| Monrovia | 10 | 2,554 | 1,689 | 7.27% | 1,423 | 1.79 | Town |
| Ashland township | 11 | 1,835 | 1,766 | 1.21% | 58 | 31.62 | Township |
| Ray township | 12 | 1,614 | 1,569 | 1% | 63 | 25.55 | Township |
| Harrison township | 13 | 1,577 | 1,540 | 0.9% | 184 | 8.59 | Township |
| Adams township | 14 | 1,252 | 1,213 | 1.13% | 42 | 29.81 | Township |
| Morgantown | 15 | 995 | 1,015 | -0.4% | 2,632 | 0.38 | Town |
| Baker township | 16 | 744 | 718 | 1.09% | 48 | 15.42 | Township |
| Paragon | 17 | 570 | 557 | 0.53% | 2,073 | 0.28 | Town |
Brown township is the largest city in Morgan County, with a population of 14,291.
Paragon is the smallest city in Morgan County.
There are 17 cities in Morgan County, Indiana.