| River Grove to Oskaloosa (Iowa) | 251.88 mi (405.36 km) |
| River Grove to Oswego (Illinois) | 30.63 mi (49.30 km) |
| River Grove to Oswego (New York) | 584.90 mi (941.31 km) |
| River Grove to Otsego (Minnesota) | 370.01 mi (595.47 km) |
| River Grove to Ottawa (Illinois) | 64.41 mi (103.65 km) |
| River Grove to Ottawa (Kansas) | 453.69 mi (730.14 km) |
| River Grove to Ottumwa (Iowa) | 245.21 mi (394.63 km) |
| River Grove to Overland (Missouri) | 259.81 mi (418.12 km) |
| River Grove to Overland Park (Kansas) | 416.81 mi (670.79 km) |
| River Grove to Overlea (Maryland) | 618.74 mi (995.76 km) |
| River Grove to Oviedo (Florida) | 989.56 mi (1,592.54 km) |
| River Grove to Owasso (Oklahoma) | 578.59 mi (931.15 km) |
| River Grove to Owatonna (Minnesota) | 310.83 mi (500.23 km) |
| River Grove to Owensboro (Kentucky) | 290.42 mi (467.39 km) |
| River Grove to Owings Mills (Maryland) | 603.89 mi (971.86 km) |
