| Drogheda to Olympia Heights (Florida) | 4,159.53 mi (6,694.12 km) |
| Drogheda to Omaha (Nebraska) | 3,988.58 mi (6,418.99 km) |
| Drogheda to On Top of the World Designated Place (Florida) | 4,063.89 mi (6,540.21 km) |
| Drogheda to Onalaska (Wisconsin) | 3,685.42 mi (5,931.11 km) |
| Drogheda to Oneida (New York) | 3,130.63 mi (5,038.27 km) |
| Drogheda to Oneonta (New York) | 3,134.21 mi (5,044.03 km) |
| Drogheda to Ontario (California) | 5,121.93 mi (8,242.96 km) |
| Drogheda to Ontario (Oregon) | 4,544.55 mi (7,313.75 km) |
| Drogheda to Opa-locka (Florida) | 4,146.95 mi (6,673.88 km) |
| Drogheda to Opelika (Alabama) | 4,007.61 mi (6,449.63 km) |
| Drogheda to Opelousas (Louisiana) | 4,382.16 mi (7,052.40 km) |
| Drogheda to Orange (California) | 5,142.35 mi (8,275.81 km) |
| Drogheda to Orange (Texas) | 4,468.92 mi (7,192.03 km) |
| Drogheda to Orange City (Florida) | 4,032.16 mi (6,489.14 km) |
| Drogheda to Orangeburg (South Carolina) | 3,785.53 mi (6,092.23 km) |
