| Klamath Falls to Olympia Heights (Florida) | 2,600.83 mi (4,185.63 km) |
| Klamath Falls to Omaha (Nebraska) | 1,322.73 mi (2,128.73 km) |
| Klamath Falls to On Top of the World Designated Place (Florida) | 2,368.97 mi (3,812.50 km) |
| Klamath Falls to Onalaska (Wisconsin) | 1,538.77 mi (2,476.41 km) |
| Klamath Falls to Oneida (New York) | 2,314.20 mi (3,724.34 km) |
| Klamath Falls to Oneonta (New York) | 2,354.66 mi (3,789.47 km) |
| Klamath Falls to Ontario (California) | 608.71 mi (979.63 km) |
| Klamath Falls to Ontario (Oregon) | 272.26 mi (438.16 km) |
| Klamath Falls to Opa-locka (Florida) | 2,597.79 mi (4,180.74 km) |
| Klamath Falls to Opelika (Alabama) | 2,084.98 mi (3,355.45 km) |
| Klamath Falls to Opelousas (Louisiana) | 1,826.19 mi (2,938.97 km) |
| Klamath Falls to Orange (California) | 619.83 mi (997.51 km) |
| Klamath Falls to Orange (Texas) | 1,760.48 mi (2,833.21 km) |
| Klamath Falls to Orange City (Florida) | 2,425.89 mi (3,904.10 km) |
| Klamath Falls to Orangeburg (South Carolina) | 2,288.01 mi (3,682.19 km) |
