| Pendleton to Olympia (Washington) | 216.02 mi (347.65 km) |
| Pendleton to Olympia Heights (Florida) | 2,525.83 mi (4,064.94 km) |
| Pendleton to Omaha (Nebraska) | 1,177.19 mi (1,894.50 km) |
| Pendleton to On Top of the World Designated Place (Florida) | 2,281.19 mi (3,671.22 km) |
| Pendleton to Onalaska (Wisconsin) | 1,353.03 mi (2,177.50 km) |
| Pendleton to Oneida (New York) | 2,113.01 mi (3,400.57 km) |
| Pendleton to Oneonta (New York) | 2,156.42 mi (3,470.41 km) |
| Pendleton to Ontario (California) | 806.54 mi (1,298.01 km) |
| Pendleton to Ontario (Oregon) | 145.43 mi (234.05 km) |
| Pendleton to Opa-locka (Florida) | 2,521.36 mi (4,057.73 km) |
| Pendleton to Opelika (Alabama) | 1,984.84 mi (3,194.29 km) |
| Pendleton to Opelousas (Louisiana) | 1,777.47 mi (2,860.56 km) |
| Pendleton to Orange (California) | 821.96 mi (1,322.82 km) |
| Pendleton to Orange (Texas) | 1,725.59 mi (2,777.07 km) |
| Pendleton to Orange City (Florida) | 2,334.92 mi (3,757.69 km) |
