| Pacifica to Olympia (Washington) | 651.92 mi (1,049.17 km) |
| Pacifica to Olympia Heights (Florida) | 2,586.25 mi (4,162.16 km) |
| Pacifica to Omaha (Nebraska) | 1,426.77 mi (2,296.17 km) |
| Pacifica to On Top of the World Designated Place (Florida) | 2,373.53 mi (3,819.82 km) |
| Pacifica to Onalaska (Wisconsin) | 1,682.21 mi (2,707.26 km) |
| Pacifica to Oneida (New York) | 2,461.73 mi (3,961.77 km) |
| Pacifica to Oneonta (New York) | 2,497.65 mi (4,019.58 km) |
| Pacifica to Ontario (California) | 367.86 mi (592.01 km) |
| Pacifica to Ontario (Oregon) | 528.11 mi (849.91 km) |
| Pacifica to Opa-locka (Florida) | 2,584.93 mi (4,160.05 km) |
| Pacifica to Opelika (Alabama) | 2,110.16 mi (3,395.98 km) |
| Pacifica to Opelousas (Louisiana) | 1,798.50 mi (2,894.40 km) |
| Pacifica to Orange (California) | 370.65 mi (596.50 km) |
| Pacifica to Orange (Texas) | 1,719.03 mi (2,766.52 km) |
| Pacifica to Orange City (Florida) | 2,433.16 mi (3,915.79 km) |
