Name | Population | Altitude | Latitude | Longitude |
Oswego (Oswego) : | 21 547 | 195 m | 41°40'58.1" N | 88°21'5.0" W |
Ottawa (Ottawa) : | 18 897 | 145 m | 41°20'44.2" N | 88°50'33.0" W |
Otterville (Otterville) : | 123 | 187 m | 39°3'2.2" N | 90°23'53.9" W |
Otto : |
| 198 m | 41°2'49.9" N | 87°53'28.0" W |
Ottville : |
| 189 m | 41°20'53.2" N | 89°15'31.0" W |
Owaneco (Owaneco) : | 247 | 187 m | 39°28'55.9" N | 89°11'37.0" W |
Owen Center : |
| 251 m | 42°22'5.9" N | 89°7'0.8" W |
Oxville : |
| 141 m | 39°42'16.9" N | 90°33'40.0" W |
Ozark : |
| 208 m | 37°32'33.0" N | 88°45'46.1" W |
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