| Piedras Blancas to Olympia Heights (Florida) | 4,258.64 mi (6,853.62 km) |
| Piedras Blancas to Omaha (Nebraska) | 4,353.96 mi (7,007.01 km) |
| Piedras Blancas to On Top of the World Designated Place (Florida) | 4,213.65 mi (6,781.21 km) |
| Piedras Blancas to Onalaska (Wisconsin) | 4,048.23 mi (6,515.00 km) |
| Piedras Blancas to Oneida (New York) | 3,394.22 mi (5,462.48 km) |
| Piedras Blancas to Oneonta (New York) | 3,386.02 mi (5,449.27 km) |
| Piedras Blancas to Ontario (California) | 5,564.65 mi (8,955.44 km) |
| Piedras Blancas to Ontario (Oregon) | 5,044.53 mi (8,118.39 km) |
| Piedras Blancas to Opa-locka (Florida) | 4,247.12 mi (6,835.09 km) |
| Piedras Blancas to Opelika (Alabama) | 4,217.87 mi (6,788.00 km) |
| Piedras Blancas to Opelousas (Louisiana) | 4,622.03 mi (7,438.45 km) |
| Piedras Blancas to Orange (California) | 5,584.98 mi (8,988.15 km) |
| Piedras Blancas to Orange (Texas) | 4,717.73 mi (7,592.46 km) |
| Piedras Blancas to Orange City (Florida) | 4,172.04 mi (6,714.24 km) |
| Piedras Blancas to Orangeburg (South Carolina) | 3,970.53 mi (6,389.96 km) |
