13 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Clay | 1 | 2,686 | 2,606 | 0.34% | 75 | 36 | Township |
| Spencer | 2 | 2,512 | 2,452 | 0.48% | 1,576 | 2 | Town |
| Spencer | 3 | 2,420 | 2,419 | 0.08% | 49 | 49 | Township |
| Spencer | 4 | 1,810 | 1,784 | 0% | 47 | 38 | Township |
| Jackson | 5 | 1,735 | 1,673 | 0.41% | 79 | 22 | Township |
| Wayne | 6 | 1,724 | 1,685 | 0.29% | 78 | 22 | Township |
| Spencer | 7 | 1,248 | 1,222 | 0.08% | 70 | 18 | Township |
| Morgan | 8 | 1,235 | 1,185 | 0.65% | 42 | 30 | Township |
| Taylor | 9 | 1,067 | 1,037 | 0.19% | 54 | 20 | Township |
| Jefferson | 10 | 1,028 | 1,001 | 0.39% | 22 | 48 | Township |
| Gosport | 11 | 862 | 842 | 0.47% | 2,299 | 0 | Town |
| Jennings | 12 | 803 | 783 | 0.38% | 41 | 20 | Township |
| Harrison | 13 | 439 | 428 | 0.46% | 25 | 18 | Township |
Clay is the largest city in Owen County, with a population of 2,686.
Harrison is the smallest city in Owen County, with a population of 439.
There are 13 cities in Owen County, Indiana.