UpAlphabetical listing of Places in Iowa
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Одубон | city | Iowa | United States | 41.72 | -94.93 | 1669 | |
| Одюбон | city | Iowa | United States | 41.72 | -94.93 | 1669 | |
| Окободжи | city | Iowa | United States | 43.39 | -95.15 | 1669 | |
| Окобоји | city | Iowa | United States | 43.39 | -95.15 | 1669 | |
| Олэман | city | Iowa | United States | 41.82 | -93.61 | 1010 | |
| Онава | city | Iowa | United States | 42.03 | -96.10 | 1046 | |
| Осејџ | city | Iowa | United States | 43.28 | -92.81 | 1164 | |
| Осиола | city | Iowa | United States | 41.03 | -93.77 | 1105 | |
| Оскалуса | city | Iowa | United States | 41.30 | -92.64 | 856 | |
| Оскеола | city | Iowa | United States | 41.03 | -93.77 | 1105 | |
| Отамва | city | Iowa | United States | 41.02 | -92.41 | 830 | |
| Оттамуа | city | Iowa | United States | 41.02 | -92.41 | 830 | |
| Оттумва | city | Iowa | United States | 41.02 | -92.41 | 830 | |
| Оэлвэйн | city | Iowa | United States | 42.67 | -91.91 | 1049 | |
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