Louisa County Census
| City/Township | 2000 Population |
2010 Population |
|---|---|---|
| Columbus City | 376 | 391 |
| Columbus City Twp | 685 | 622 |
| Columbus Junction | 1,900 | 1,899 |
| Concord Twp | 485 | 439 |
| Cotter | 48 | 48 |
| Eliot Twp | 251 | 161 |
| Elm Grove Twp | 223 | 202 |
| Fredonia | 251 | 244 |
| Grandview | 600 | 556 |
| Grandview Twp | 513 | 507 |
| Jefferson Twp | 234 | 255 |
| Letts | 392 | 384 |
| Marshall Twp | 226 | 203 |
| Morning Sun | 872 | 836 |
| Morning Sun Twp | 345 | 362 |
| Oakland Twp | 277 | 280 |
| Oakville | 439 | 173 |
| Port Louisa Twp | 950 | 867 |
| Union Twp | 244 | 203 |
| Wapello | 2,124 | 2,067 |
| Wapello Twp | 748 | 688 |
| Total Population | 12,183 | 11,387 |