| Peniche to Olympia Heights (Florida) | 4,134.93 mi (6,654.53 km) |
| Peniche to Omaha (Nebraska) | 4,362.75 mi (7,021.16 km) |
| Peniche to On Top of the World Designated Place (Florida) | 4,114.16 mi (6,621.11 km) |
| Peniche to Onalaska (Wisconsin) | 4,059.77 mi (6,533.57 km) |
| Peniche to Oneida (New York) | 3,364.20 mi (5,414.16 km) |
| Peniche to Oneonta (New York) | 3,350.18 mi (5,391.59 km) |
| Peniche to Ontario (California) | 5,604.88 mi (9,020.18 km) |
| Peniche to Ontario (Oregon) | 5,126.02 mi (8,249.54 km) |
| Peniche to Opa-locka (Florida) | 4,124.05 mi (6,637.02 km) |
| Peniche to Opelika (Alabama) | 4,147.60 mi (6,674.91 km) |
| Peniche to Opelousas (Louisiana) | 4,561.12 mi (7,340.41 km) |
| Peniche to Orange (California) | 5,624.95 mi (9,052.48 km) |
| Peniche to Orange (Texas) | 4,660.12 mi (7,499.74 km) |
| Peniche to Orange City (Florida) | 4,068.47 mi (6,547.56 km) |
| Peniche to Orangeburg (South Carolina) | 3,891.53 mi (6,262.81 km) |
