| Elk Plain to Olympia Heights (Florida) | 2,716.32 mi (4,371.49 km) |
| Elk Plain to Omaha (Nebraska) | 1,356.81 mi (2,183.57 km) |
| Elk Plain to On Top of the World Designated Place (Florida) | 2,470.14 mi (3,975.30 km) |
| Elk Plain to Onalaska (Wisconsin) | 1,515.28 mi (2,438.61 km) |
| Elk Plain to Oneida (New York) | 2,261.68 mi (3,639.83 km) |
| Elk Plain to Oneonta (New York) | 2,306.75 mi (3,712.35 km) |
| Elk Plain to Ontario (California) | 932.08 mi (1,500.04 km) |
| Elk Plain to Ontario (Oregon) | 333.78 mi (537.17 km) |
| Elk Plain to Opa-locka (Florida) | 2,711.66 mi (4,364.00 km) |
| Elk Plain to Opelika (Alabama) | 2,172.16 mi (3,495.75 km) |
| Elk Plain to Opelousas (Louisiana) | 1,970.75 mi (3,171.62 km) |
| Elk Plain to Orange (California) | 944.99 mi (1,520.81 km) |
| Elk Plain to Orange (Texas) | 1,919.23 mi (3,088.71 km) |
| Elk Plain to Orange City (Florida) | 2,523.28 mi (4,060.82 km) |
| Elk Plain to Orangeburg (South Carolina) | 2,345.88 mi (3,775.32 km) |
