| River Grove to Oakleaf Plantation (Florida) | 878.15 mi (1,413.25 km) |
| River Grove to Oakley (California) | 1,801.63 mi (2,899.45 km) |
| River Grove to Oakton (Virginia) | 592.19 mi (953.04 km) |
| River Grove to Oakville (Missouri) | 273.57 mi (440.27 km) |
| River Grove to Oatfield (Oregon) | 1,739.91 mi (2,800.11 km) |
| River Grove to Ocala (Florida) | 936.32 mi (1,506.87 km) |
| River Grove to Ocean Acres (New Jersey) | 723.76 mi (1,164.77 km) |
| River Grove to Ocean City (New Jersey) | 717.42 mi (1,154.57 km) |
| River Grove to Ocean Pines (Maryland) | 712.47 mi (1,146.61 km) |
| River Grove to Ocean Pointe (Hawaii) | 4,246.54 mi (6,834.15 km) |
| River Grove to Ocean Springs (Mississippi) | 797.43 mi (1,283.33 km) |
| River Grove to Oceanside (California) | 1,711.77 mi (2,754.82 km) |
| River Grove to Oceanside (New York) | 741.91 mi (1,194.00 km) |
| River Grove to Ocoee (Florida) | 987.53 mi (1,589.27 km) |
| River Grove to Oconomowoc (Wisconsin) | 87.83 mi (141.34 km) |
