| River Grove to Odenton (Maryland) | 617.39 mi (993.60 km) |
| River Grove to Odessa (Texas) | 1,057.53 mi (1,701.94 km) |
| River Grove to Ogden (Utah) | 1,244.03 mi (2,002.07 km) |
| River Grove to Oildale (California) | 1,730.82 mi (2,785.48 km) |
| River Grove to Ojus (Florida) | 1,186.52 mi (1,909.52 km) |
| River Grove to Okemos (Michigan) | 183.08 mi (294.64 km) |
| River Grove to Oklahoma City (Oklahoma) | 685.68 mi (1,103.50 km) |
| River Grove to Okmulgee (Oklahoma) | 618.94 mi (996.08 km) |
| River Grove to Olathe (Kansas) | 423.00 mi (680.75 km) |
| River Grove to Old Jamestown (Missouri) | 249.00 mi (400.73 km) |
| River Grove to Oldsmar (Florida) | 1,001.70 mi (1,612.08 km) |
| River Grove to Olean (New York) | 482.81 mi (777.01 km) |
| River Grove to Olive Branch (Mississippi) | 493.21 mi (793.74 km) |
| River Grove to Olivehurst (California) | 1,770.87 mi (2,849.94 km) |
| River Grove to Olney (Maryland) | 596.55 mi (960.05 km) |
