| Rosemead to Olympia (Washington) | 930.79 mi (1,497.97 km) |
| Rosemead to Olympia Heights (Florida) | 2,319.10 mi (3,732.22 km) |
| Rosemead to Omaha (Nebraska) | 1,298.73 mi (2,090.10 km) |
| Rosemead to On Top of the World Designated Place (Florida) | 2,123.60 mi (3,417.61 km) |
| Rosemead to Onalaska (Wisconsin) | 1,585.42 mi (2,551.48 km) |
| Rosemead to Oneida (New York) | 2,347.52 mi (3,777.97 km) |
| Rosemead to Oneonta (New York) | 2,377.58 mi (3,826.34 km) |
| Rosemead to Ontario (California) | 27.32 mi (43.97 km) |
| Rosemead to Ontario (Oregon) | 690.50 mi (1,111.25 km) |
| Rosemead to Opa-locka (Florida) | 2,319.06 mi (3,732.17 km) |
| Rosemead to Opelika (Alabama) | 1,881.77 mi (3,028.42 km) |
| Rosemead to Opelousas (Louisiana) | 1,533.90 mi (2,468.57 km) |
| Rosemead to Orange (California) | 23.63 mi (38.03 km) |
| Rosemead to Orange (Texas) | 1,445.89 mi (2,326.94 km) |
| Rosemead to Orange City (Florida) | 2,184.53 mi (3,515.67 km) |
