| Carlow to Octeville | 318.21 mi (512.11 km) |
| Carlow to Oignies | 455.24 mi (732.63 km) |
| Carlow to Oissel | 423.11 mi (680.93 km) |
| Carlow to Olivet | 518.39 mi (834.26 km) |
| Carlow to Ollioules | 890.44 mi (1,433.02 km) |
| Carlow to Olonne-sur-Mer | 491.97 mi (791.75 km) |
| Carlow to Oloron-Sainte-Marie | 726.48 mi (1,169.16 km) |
| Carlow to Onet Village | 727.73 mi (1,171.18 km) |
| Carlow to Onnaing | 481.76 mi (775.32 km) |
| Carlow to Orange | 804.11 mi (1,294.08 km) |
| Carlow to Orchies | 465.10 mi (748.50 km) |
| Carlow to Orleans | 516.79 mi (831.69 km) |
| Carlow to Orly | 494.99 mi (796.61 km) |
| Carlow to Ormesson-sur-Marne | 498.43 mi (802.15 km) |
| Carlow to Orsay | 489.67 mi (788.04 km) |
