| City/Township | Population |
| Columbus City | 376 |
| Columbus City Twp | 685 |
| Columbus Junction | 1,900 |
| Concord Twp | 485 |
| Cotter | 48 |
| Eliot Twp | 251 |
| Elm Grove Twp | 223 |
| Fredonia | 251 |
| Grandview | 600 |
| Grandview Twp | 513 |
| Jefferson Twp | 234 |
| Letts | 392 |
| Marshall Twp | 226 |
| Morning Sun | 872 |
| Morning Sun Twp | 345 |
| Oakland Twp | 277 |
| Oakville | 439 |
| Port Louisa Twp | 950 |
| Union Twp | 244 |
| Wapello | 2,124 |
| Wapello Twp | 748 |
| Total Population | 12,183 |