| River Grove to Orangeburg (South Carolina) | 695.53 mi (1,119.35 km) |
| River Grove to Orangevale (California) | 1,761.87 mi (2,835.45 km) |
| River Grove to Orchards (Washington) | 1,735.44 mi (2,792.92 km) |
| River Grove to Orcutt (California) | 1,818.42 mi (2,926.47 km) |
| River Grove to Oregon (Ohio) | 227.72 mi (366.49 km) |
| River Grove to Oregon (Wisconsin) | 105.08 mi (169.12 km) |
| River Grove to Oregon City (Oregon) | 1,740.22 mi (2,800.62 km) |
| River Grove to Orem (Utah) | 1,243.20 mi (2,000.74 km) |
| River Grove to Orinda (California) | 1,829.07 mi (2,943.60 km) |
| River Grove to Orland Park (Illinois) | 21.92 mi (35.28 km) |
| River Grove to Orlando (Florida) | 998.17 mi (1,606.40 km) |
| River Grove to Ormond Beach (Florida) | 950.09 mi (1,529.02 km) |
| River Grove to Oro Valley (Arizona) | 1,426.78 mi (2,296.18 km) |
| River Grove to Oroville (California) | 1,762.79 mi (2,836.94 km) |
| River Grove to Oshkosh (Wisconsin) | 149.53 mi (240.65 km) |
