| Grain Valley to Olympia Heights (Florida) | 1,221.17 mi (1,965.28 km) |
| Grain Valley to Omaha (Nebraska) | 183.20 mi (294.83 km) |
| Grain Valley to On Top of the World Designated Place (Florida) | 965.06 mi (1,553.11 km) |
| Grain Valley to Onalaska (Wisconsin) | 370.64 mi (596.49 km) |
| Grain Valley to Oneida (New York) | 1,003.90 mi (1,615.62 km) |
| Grain Valley to Oneonta (New York) | 1,027.50 mi (1,653.59 km) |
| Grain Valley to Ontario (California) | 1,339.66 mi (2,155.98 km) |
| Grain Valley to Ontario (Oregon) | 1,223.07 mi (1,968.34 km) |
| Grain Valley to Opa-locka (Florida) | 1,214.82 mi (1,955.07 km) |
| Grain Valley to Opelika (Alabama) | 660.86 mi (1,063.55 km) |
| Grain Valley to Opelousas (Louisiana) | 598.97 mi (963.94 km) |
| Grain Valley to Orange (California) | 1,357.20 mi (2,184.20 km) |
| Grain Valley to Orange (Texas) | 615.08 mi (989.87 km) |
| Grain Valley to Orange City (Florida) | 1,014.52 mi (1,632.70 km) |
| Grain Valley to Orangeburg (South Carolina) | 834.40 mi (1,342.84 km) |
