UpAlphabetical listing of Places in Illinois
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|
| Олимпија Филдс | city | Illinois | United States | 41.51 | -87.67 | 830 | |
| Олсип | city | Illinois | United States | 41.67 | -87.74 | 830 | |
| Олтон | city | Illinois | United States | 38.89 | -90.18 | 830 | |
| Орегон | city | Illinois | United States | 42.01 | -89.33 | 830 | |
| Орланд Парк | city | Illinois | United States | 41.63 | -87.85 | 830 | |
| Орора | city | Illinois | United States | 41.76 | -88.32 | 830 | |
| Освиго | city | Illinois | United States | 41.68 | -88.35 | 830 | |
| Оук Брук | city | Illinois | United States | 41.83 | -87.93 | 830 | |
| Оук Лон | city | Illinois | United States | 41.71 | -87.76 | 830 | |
| Оук Форист | city | Illinois | United States | 41.60 | -87.74 | 830 | |
| Оук-Парк | city | Illinois | United States | 41.89 | -87.78 | 830 | |
| Оукбрук Терас | city | Illinois | United States | 41.85 | -87.96 | 830 | |
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