| Township | Census 2000 | Census 1990 | Change | Percent chg. |
Rank in % chg. |
||
| Total | Rank | Total | Rank | ||||
| Owen county | 21,786 | N/A | 17,281 | N/A | 4,505 | 26.1% | N/A |
| Clay | 2,553 | 392 | 1,931 | 445 | 622 | 32.2% | 71 |
| Franklin | 1,155 | 720 | 1,003 | 726 | 152 | 15.2% | 271 |
| Harrison | 473 | 944 | 355 | 977 | 118 | 33.2% | 65 |
| Jackson | 1,981 | 468 | 1,103 | 701 | 878 | 79.6% | 8 |
| Jefferson | 1,078 | 746 | 849 | 804 | 229 | 27.0% | 96 |
| Jennings | 839 | 831 | 706 | 859 | 133 | 18.8% | 201 |
| Lafayette | 1,287 | 669 | 912 | 774 | 375 | 41.1% | 33 |
| Marion | 1,004 | 768 | 798 | 827 | 206 | 25.8% | 105 |
| Montgomery | 1,225 | 689 | 872 | 792 | 353 | 40.5% | 35 |
| Morgan | 1,200 | 701 | 885 | 785 | 315 | 35.6% | 50 |
| Taylor | 993 | 773 | 795 | 829 | 198 | 24.9% | 117 |
| Washington | 6,399 | 177 | 5,570 | 167 | 829 | 14.9% | 278 |
| Wayne | 1,599 | 560 | 1,502 | 550 | 97 | 6.5% | 529 |