| Wentzville to Oskaloosa (Iowa) | 195.14 mi (314.05 km) |
| Wentzville to Oswego (Illinois) | 238.86 mi (384.41 km) |
| Wentzville to Oswego (New York) | 811.96 mi (1,306.73 km) |
| Wentzville to Otsego (Minnesota) | 467.48 mi (752.33 km) |
| Wentzville to Ottawa (Illinois) | 206.00 mi (331.52 km) |
| Wentzville to Ottawa (Kansas) | 237.50 mi (382.22 km) |
| Wentzville to Ottumwa (Iowa) | 173.07 mi (278.53 km) |
| Wentzville to Overland (Missouri) | 28.06 mi (45.15 km) |
| Wentzville to Overland Park (Kansas) | 205.60 mi (330.88 km) |
| Wentzville to Overlea (Maryland) | 769.64 mi (1,238.62 km) |
| Wentzville to Oviedo (Florida) | 894.28 mi (1,439.20 km) |
| Wentzville to Owasso (Oklahoma) | 323.10 mi (519.97 km) |
| Wentzville to Owatonna (Minnesota) | 384.49 mi (618.78 km) |
| Wentzville to Owensboro (Kentucky) | 216.07 mi (347.73 km) |
| Wentzville to Owings Mills (Maryland) | 754.94 mi (1,214.96 km) |
